Board Thread:Game Discussion/@comment-17706575-20130924161525/@comment-24424436-20140412200049

108.12.110.180 wrote: Can anyone tell me why I can't use my fully upgrade hydra to enhance my other armors if it's not equip in arena or any other place

It should be showing up unless you have it equipped in arena, storyline, epic boss, or summoning stone. Check to see if it is equipped in any of those places. If it is equipped in the summoning stone, then you will have to spend 4 gems to remove it.