What am I supposed to do in the temple?

Hint 1 of 5:

If you explore carefully, you'll probably get a few suggestions about what to
do here.

Hint 2 of 5:

Go visit the four crypts in front of the altar.  If you look on the map, on
the last page of the journal that came with your game, they are right above
the giant staircase in the center of the temple.

Hint 3 of 5:

Each of the people wants you to get their elements for them.

Hint 4 of 5:

The map in the journal tells you where each of these elements is.