Story
You need help from the Steel Hammer Merchants to gather information on the Mau. Crobakhi says that if you need their help, you will have to resolve the issue at the Fire Temple first. Investigate the Fire Temple.
After completion (spoilers)
"Let's head right there." You need help from the Steel Hammer Merchants to gather information on the Mau. Crobakhi says that if you need their help, you will have to resolve the issue at the Fire Temple first. You surveyed the Fire Temple and warned the Steel Hammer Merchants about the dangers within.