Ya they nearly killed me at rank 24, here is a tip, don't bother going INTO copperbell mines, that was a lesson in PAIN.

However, they did steal a LOT of eggs.

You obtain a painted Archon egg.
You obtain a wind Archon egg.
You obtain a lightning Archon egg.
You obtain an ice Archon egg.
You obtain a water Archon egg.
You obtain an astral Archon egg.