--Structure--
Path 1:
From the first room, take the northeast exit northward.
That room has a P. cure and M. bulb in the northeast corner. Take the southwest exit westward.
Meet the end of path 2.
Path 2:
From the first room, take the exit westward.
Climb under the brush and meet the end of path 1.
Paths 1 and 2 meet up:
Take the northmost exit east.
Take the north exit.
On the west, with a lone dead tree, is one dungun. Here's your first soul.
These souls don't restore your health. Thanks!
Take the exit northward.
Take the exit eastward.
Take the exit northward.
On the east wall of the room is a lizard man with your second soul.
Take the exit southward.
Right by the entrance is a dungun and the third soul.
Backtrack a couple rooms: exit northward, go west and exit southward, then exit westward.
Go north, climbing under the brush, and drop down the ledge to the west. There's a douma that's got your fourth soul.
In the northwest is the first altar.