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PvEExpedition4 min read

Aion 2 Krao Cave Guide: Bosses, Mechanics and Loot

How to clear Krao Cave in Aion 2: what each boss does, in the game client's own data, how to survive the final boss's wipe casts, and which cube rewards are worth your week.

What it isGame client

Expedition: 3 bosses, each with its own Odyle Energy Cube of loot.

Players
1–5
Time limit
60 min
Bosses
3
Can I enter?Game client
  • ExplorationLevel 20 · Item Level 200no weekly entry limit
  • ConquestLevel 45 · Item Level 70010 entries a week
  • +1 version · LaterNot open in EU/NA yet
What you getGame client
  • Berk Ring
  • Berk Earrings
  • Berk Necklace
  • Rupture Claymore
  • Wrathful Mind

Unique gear from the Conquest cubes, and a Guaranteed Reward you pick after 14 cube claims.

Map: Krao CaveDungeon pageEvery drop with its odds

Panels marked Game client come from the EU/NA client 2.0.7.0 (Steam build 25926599, extracted October 16, 2026) and update with each patch. Advice is written by aion2.gg.

In the gameGame clientKrao Cave is rich in a special mineral called Krao, known for its ability to repel external forces. Lepharists conducted various experiments with Krao here and, during the Last War, created the powerful Berk, which played a key role in the conflict.

On this page
  1. 1.Route
  2. 2.Enhanced Harcon
  3. 3.Neglected Gadioton
  4. 4.Ultimate Berk
  5. 5.Loot: the cube is the reward
  6. 6.Exploration vs Conquest
  7. 7.FAQ

Krao Cave is the first Expedition a character can enter, and the first Conquest run at the level cap, so almost every party learns its bosses early. The panels above answer whether you can enter and what you get. Below: the way through the cave, each boss with the casts that matter, and what to do with the cubes they leave. For how this dungeon fits among the others, see the dungeon overview and the endgame PvE ladder.

Route

Positions from the client's spawn data: Conquest Open the full map
On the mapGame client
  1. Enhanced HarconMini-Boss Rewards 1
  2. Neglected GadiotonMini-Boss Rewards 2
  3. Krao Seal GuardianDefeat the Krao Seal Guardian to open the inner door's seal, kru!
  4. Ultimate BerkFinal Boss Rewards · Odyle Energy Cube
  5. To the Red CavityKibelisk
  6. To the Weathered Testing GroundKibelisk
  7. Sealed Cave EntranceKibelisk

Binding a Kibelisk takes 5 s.

What Phazkhi tells you on the way11 lines
  1. “The Croka can't move, so it's a good idea to avoid them, kru.”
  2. “If a test subject spots you, it will never stop chasing you. Deal with them, kru.”
  3. “Either path is fine, kru.”
  4. “Be careful of the traps on the floor.”
  5. “There is a Kibelisk here! Bind it, kru!”
  6. “There's Gadioton there! Remove it, kru!”
  7. “There's Harcon there! Take it down, kru!”
  8. “Defeat the Krao Seal Guardian to open the inner door's seal, kru!”
  9. “Good job! Now bind the Kibelisk, kru.”
  10. “The sealed door has opened, kru!”
  11. “This is an Odyle Energy Cube!”

The game's own captions, in the order of the client's records: close to the path, not a verified route.

Advice
  • Phazkhi says either path is fine. Each mini-boss has its own cube, so clearing both gives you a cube claim from each before the final boss.
  • Krao Seal Guardian stands between you and the inner door: Phazkhi asks you to defeat it, then to bind the Kibelisk next to it, which takes 5 s. Bind it, so a wipe on the final boss does not cost you the walk.
  • The Croka along the way cannot move, in the guide's own words: walk around them instead of fighting them.

Enhanced Harcon

Names in other regions: Korean

KR강화된 하르콘

Mini-Boss Rewards 1Boss levelExploration22Conquest45NPC page: stats, skills, spawn
Game client
StaggerAuto-Analysis ModeNo enrage

Also in the fight: Krao Giant Test Subject.

AdviceHow to beat Enhanced Harcon
  • It calls a Krao Giant Test Subject at most every 20 s: a damage dealer picks it up, so it does not reach the healer.
  • Its close slam covers 6 m around the spot it marks: melee step out when the ground marker appears, then back in.
  • No enrage timer and no named casts in the client data: a calm fight to learn stagger points on.
What Enhanced Harcon doesGame client
4 attacksnamed only “Attack” in the client
  • circle, radius 3 mclient name “Attack”#1218540
    Cast
    1.27 s
    Ground marker
    0.7 s
    Cast range
    20 m
    Min. cooldown
    8 s
    Aimed at a target
  • sphere, radius 6 mclient name “Attack”#1218550
    Cast
    1 s
    Ground marker
    2 s
    Cast range
    3.5 m
    Min. cooldown
    8 s
    Aimed at a target
  • Leap to a targetclient name “Attack”#1218630
    Cast
    0.8 s
    Cast range
    50 m
    Min. cooldown
    12 s
    Teleports
  • Summonclient name “Attack”#1218560
    Cast
    1.8 s
    Cast range
    20 m
    Min. cooldown
    20 s
    Summons Krao Giant Test Subject

1 cast with no effect in the client data is left out.

Neglected Gadioton

Names in other regions: Korean

KR방치된 가디오톤

Mini-Boss Rewards 2Boss levelExploration22Conquest45NPC page: stats, skills, spawn
Game client
StaggerAuto-Analysis ModeNo enrage
AdviceHow to beat Neglected Gadioton
  • At most every 45 s it pulls everything within 30 m to itself, then knocks down anyone still inside 8 m for 2 s. Keep a dash or a crowd-control break for the moment right after the pull.
  • Its line attack hits the same lane several times (5 hits over 30 m): step sideways out of the lane and stay out until it ends, instead of backing up along it.
What Neglected Gadioton doesGame client
6 attacksnamed only “Attack” in the client
  • Single targetclient name “Attack”#1228220
    Cast
    0.93 s
    Ground marker
    2 s
    Cast range
    20 m
    Min. cooldown
    8 s
  • sphere, radius 6 mclient name “Attack”#1218550
    Cast
    1 s
    Ground marker
    2 s
    Cast range
    3.5 m
    Min. cooldown
    8 s
    Aimed at a target
  • line 30 m long, 6 m wideclient name “Attack”#1218620
    Cast
    1.2 s
    Ground marker
    2 s
    Cast range
    20 m
    Min. cooldown
    15 s
    1. Area: line 30 m long, 6 m wide · 5 hits on the same area
  • Leap to a targetclient name “Attack”#1218630
    Cast
    0.8 s
    Cast range
    50 m
    Min. cooldown
    12 s
    Teleports
  • circle, radius 30 m, then circle, radius 8 mclient name “Attack”#1228230
    Cast
    1.5 s
    Ground marker
    0.96 s
    Min. cooldown
    45 s
    1. Area: circle, radius 30 m
    2. Area: circle, radius 8 m
    Around the casterPulledKnockdown2 s
    Advice

    The knockdown circle is far smaller than the pull, so the pull itself is harmless: what matters is leaving the centre at once. Ranged players who stand outside the pull radius skip the mechanic.

  • circle, radius 3 mclient name “Attack”#1218590
    Cast
    1.5 s
    Cast range
    20 m
    Min. cooldown
    45 s
    Aimed at a target

1 cast with no effect in the client data is left out.

Ultimate Berk

Names in other regions: Korean

KR완성체 베르크

Final Boss RewardsBoss levelExploration22Conquest45NPC page: stats, skills, spawn
Game client
ConquestEnrageStaggerAuto-Analysis Mode
ExplorationStaggerAuto-Analysis ModeNo enrage

Ultimate Berk has 4 form records in the client. Also in the fight: Chroma, Twisted Croka.

What Ultimate Berk says (cues you can hear)
  1. On pull“The seal has been broken. Evolution will begin again.”
  2. On pull“Daeva... must not be suffered to live...”
  3. On death“Severance and unity... are the same... There is no complete annihilation...”
  4. When Frenzy starts“Only I will remain in the end!”
AdviceHow to beat Ultimate Berk
  • In Conquest the enrage timer runs out at 05:00. After it Frenzy gives the boss +200% damage and +100% combat speed: treat the timer as the damage check of the run. Exploration has no enrage timer.
  • Wave of Fury: when the alert banner appears, get behind a rock, as Phazkhi tells you. Fight where a rock is close.
  • Extinction for Eternity: this is the stagger check. Save your stagger skills for it.
What Ultimate Berk doesGame client

Watch for: the raid-wide casts

  • Wave of FuryRaid-wide alert#1800050
    Cast
    6 s
    Alert banner
    5 s
    Cast range
    90 m
    1. Area: circle, radius 45 m · 2 hits on the same area
    Aimed at a targetStun3 sExtra damage scaled on max HP

    The client also holds a copy of this cast that targets the boss itself.

    Phazkhi“Quickly, hide behind the rock!”
    Ultimate Berk“Disappear from my sight!”
    Advice

    The circle has a radius of 45 m, so running out of it is rarely possible: use the 5 s of the alert banner to reach the rock. The client flags its casts with a hidden cast bar (not checked in game), so do not wait for a cast bar. Where the rocks stand is not in the client data: look for them on your first pull.

  • Extinction for EternityRaid-wide alert#1800140
    Cast
    8 s
    Alert banner
    9 s
    Ground marker
    10 s
    Min. cooldown
    30 s
    1. Area: circle, radius 90 m
    Around the casterStun3 sExtra damage scaled on max HP
    Phazkhi“Now! Use your special skill to increase Stagger, kru!”
    Ultimate Berk“Life will shatter, and merge with me!”
    Advice

    Phazkhi's line is the counter: the party has the 8 s cast to deplete the boss's stagger points, so hold your stagger skills for this cast instead of spending them on cooldown. A staggered boss stays down for 5 s: that is your damage window. Whether a stagger always stops the cast is not in the client data.

Other mechanics

Show the listHide the list
  • Roar of Madness#1800090
    Cast
    1.5 s
    Ground marker
    10 s
    Min. cooldown
    5 s
    1. Area: circle, radius 19 m
    Around the caster
  • Rush#1800030
    Cast
    2 s
    Ground marker
    3 s
    Min. cooldown
    5 s
    1. Area: line 37 m long, 11.2 m wide
    Advice

    A charge lane 37 m long: step sideways out of the lane, not back along it.

  • Roar of Fury#1800040
    Cast
    2.5 s
    Ground marker
    2.5 s
    Min. cooldown
    5 s
    1. Area: circle, radius 20 m
    Around the casterStun2 s
    Advice

    Ranged players can stay outside 20 m. Melee keep a stun break, or leave when the ground marker appears: the stun lasts 2 s.

  • Drana Wave#1800060
    Cast
    2 s
    Ground marker
    1.5 s
    Cast range
    30 m
    Min. cooldown
    5 s
    1. Area: cross with arms 56 m and 56 m long, 2.2 m and 6 m wide
    2. Area: cross with arms 56 m and 56 m long, 2.2 m and 6 m wide
    Advice

    Stand on a diagonal between the arms of the crosses, never on a line through the boss.

  • Wrathful Blade#1800070
    Cast
    1.2 s
    Ground marker
    2 s
    Cast range
    8 m
    Min. cooldown
    5 s
    1. Area: line 15.5 m long, 8.5 m wide
    2. Area: cone of 220°, radius 18 m
    3. Area: cone of 300°, radius 30 m
    PullBleed20 s
    Advice

    3 hits in a row: a pull into a line, then cones of 220° and 300°. The last cone leaves only a 60° gap. The client does not say which way it points; cones usually face the boss's front, so everyone but the tank stays behind. The bleed lasts 20 s: healers, plan a cleanse or steady healing.

  • Chroma Storm#1800130
    Cast
    1.5 s
    Ground marker
    1.5 s
    Cast range
    90 m
    Min. cooldown
    5 s
    1. Area: circle, radius 12 m
    Aimed at a targetKnockdown2 sSummons Ultimate BerkTeleports
  • Twisted CrokaCroka Light Beam#1800400
    Cast
    1.2 s
    Ground marker
    10 s
    Cast range
    80 m
    Min. cooldown
    4 s
    1. Area: circle, radius 7 m
    Aimed at a targetDefense Reduction20 s

    The client also holds a copy of this cast that targets the boss itself.

    Advice

    The adds drop circles of 7 m that lower defence for 20 s. Kill the adds, or keep the tank out of the circles.

1 more attack
  • line 17.5 m long, 8.5 m wideunnamed in the client#1800075
    Cast
    0.3 s
    Cast range
    80 m
    Min. cooldown
    5 s
    Pull

Loot: the cube is the reward

The bosses themselves drop almost nothing. What you came for is in the cube each of them leaves, and opening a cube costs a resource that every character refills over time.

How the cube worksGame client
  1. Defeat a boss
    Each of the 3 bosses leaves its own Odyle Energy Cube.
  2. Open it with Odyle Energy
    20Exploration40ConquestOne claim per cube.
  3. Fill Condensed Cube Energy
    Every claim counts. When it is full you pick one Guaranteed Reward:Explorationafter 1 claimConquestafter 14 claims
  4. Collect it before you go back
    Dungeons can be entered after collecting the guaranteed reward.
Odyle Energy holds up to 560 (840 with a membership) and refills 15 every 3 h.
Worked out from those numbers: a full bar opens 14 cubes in Conquest, and a day of refill (120) opens 3.
[Conquest/Transcendence] Remaining Unobtained Cube Count
  • Clearing and exiting the dungeon without obtaining Odyle Energy Cube rewards will still lower the count.
  • The count resets weekly. You cannot enter Conquest and Transcendence Dungeons when the count is 0.
  • Limit is applied on a per-server basis.
The client's entrance data takes 1 of this count per entry, so a cap of 10 gives 10 runs a week. Whether opening cubes uses more is not checked in game. The Guaranteed Reward needs 14 claims: at least 5 full runs with 3 cubes each.

Worth running it for

Chance per cube you openGame client

The last column assumes you open all 3 cubes of one run. Cubes also hold fixed rewards and more gear: Every drop with its odds

Guaranteed Reward: pick one

Conquestafter 14 claimsGame client
Explorationafter 1 claimGame client
Advice
  • Short on Odyle Energy? Open the final boss cube first: for Berk Ring it gives 1.72% a cube, against 0.86% from a mini-boss cube, and every claim counts toward the Guaranteed Reward all the same.
  • For your first Guaranteed Reward in Conquest, pick the accessory you are still missing: Berk Ring, Berk Earrings or Berk Necklace. The voucher can wait.
  • In Exploration the pick comes after 1 claim, which is how a fresh character gears up toward the Item Level 700 that Conquest asks for.

Exploration vs Conquest

Version by versionGame client
FactExplorationConquest
Entry level2045
Item Level200700
Players1–51–5
Time limit60 min60 min
Weekly entriesnone10 entries a week+10 every Wednesday, 16:00 server time
Cube cost20 Odyle Energy40 Odyle Energy
Guaranteed Rewardafter 1 claimafter 14 claims
Best gear grade in cubesEpicUnique
Final boss enragenonethen Frenzy
Boss level2245
The weekly count in the game's own words
[Conquest/Transcendence] Remaining Unobtained Cube CountClearing and exiting the dungeon without obtaining Odyle Energy Cube rewards will still lower the count.The count resets weekly. You cannot enter Conquest and Transcendence Dungeons when the count is 0.※Limit is applied on a per-server basis.

The reset time is the client's server-time field, as of the data build named at the top of the page.

+1 version · Later The client holds 1 more version that EU/NA cannot enter yet; it is left out here. Boss HP per version is not in the client data.

FAQ

What level and item level do I need for Krao Cave?

Exploration opens at level 20 with Item Level 200. Conquest opens at level 45 with Item Level 700.

How many bosses are in Krao Cave?

3 bosses, each with its own cube: Enhanced Harcon, Neglected Gadioton and the final boss, Ultimate Berk.

How do you survive Wave of Fury?

Ultimate Berk casts it for 6 s over a circle of 45 m radius, and it stuns for 3 s. The game's own guide, Phazkhi, tells you to hide behind the rock.

Does Ultimate Berk enrage?

In Conquest, yes: after 05:00 the boss gains Frenzy. In Exploration the client sets no enrage timer.

What is the best loot in Krao Cave?

In Conquest: Berk Ring, Berk Earrings, Berk Necklace and the weapons of the same grade. After 14 cube claims you also pick a Guaranteed Reward.

How long does a Krao Cave run take?

The client only sets a time limit of 60 min. It holds no data on typical clear times.

Try it

The tools that do what this guide explains, with the game client's own numbers.

dungeonskrao-caveexpeditionbossesboss-mechanicslootpveparty

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