Head to Wajaom Woodlands and enter Aydeewa Subterrane through zone #8.

Walk near the ??? labeled for "What Friends Are For" quest and receive a brief cutscene. Invisible and sneak will be dropped after the cutscene so beware of the tigers and chigoes around!

Head back to Nashmau, speak to Tsetseroon again. You will need to trade him a Cobalt Jellyfish and a Tin Ore. He will give you A pot of Tsetseroon's stew.

Walk back to where the location where you got the cutscene and check the ??? on top of the steps.

Pick to look in his bag to get the map, and speak to Tsetseroon back in town once again to obtain a Imp. Bronze Piece.

Quest information provided by Huggo and Alananir.