The Temple of the Elders is the fifth and penultimate level. Unlike the first four levels, the fifth level does not have an alternative area, so the fifth level is always the Temple of the Elders.
On the left is the Temple, which has three floors.
Percentage Health Shrines can be found on this level, as well as potential golden chests.
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.
It should be noted that the pillars could be referencing the pillars in Cave Story in the level 'Bottom of the Island.'
There are no platforms or Artifact found in Variant 2.
Golden chest Edit
There is always a golden chest at the highest platform of the right side of the map. It appears to only be reachable with a Photon Jetpack or stacked jumping assist items. However, part of the platform is illusory; with significantly fewer items than expected (possibly just a single Hopoo Feather [verification needed]), one can jump left from the highest of the small platforms and will enter into the wall. From here another (double?[verification needed]) jump will reach the top of the platform.