Temple of the Elders

Spawns

 * Elder Lemurian
 * Archer Bug
 * Clay Man
 * Black Imp
 * Temple Guard

Bosses

 * Toxic Beast
 * Imp Overlord
 * Scavenger

Artifact
Jumping off the right edge of the map and falling down onto a platform there will put you at the start of a jumping puzzle leading half way back across the level where you will find the artifact gate and the Spirit artifact.