Story
Jackson is the keeper of the Monolith at the Dawn Legion Base. Go to Jackson after hearing about him from Luteros.
After completion (spoilers)
"So if you ever come across an Empyrean Trace, make sure to resonate with a Monolith." Jackson is the keeper of the Monolith at the Dawn Legion Base. Luteros introduced you to Jackson, and he offered various insights into this relic of the Empyrean Lords. Monoliths are a medium left behind for Daeva to resonate with using Empyrean Traces, manifestations of the Empyrean Lord's power which had been scattered during war. When the two relics resonated with each other, you received various blessings from the Empyrean Lords. Jackson urged you to resonate with the Monolith and enhance your equipment as often as possible, for the sake of the Legion.