What does chief Jumu want

Hint 1 of 7:

You will have to get the sacred hide from the Jukari ritual cave.

Hint 2 of 7:

The cave is far west of the Jukari village, it is on the map.

Hint 3 of 7:

You should follow the south cliff wall until you cross the lava.

Hint 4 of 7:

Ask Prof. Rafkin if you are having trouble crossing the lava.

Hint 5 of 7:

(You did bring the fire extinguisher from the lab, didn't you?)