Stone Meyft can be summoned

But I don’t even see the troop when I check unowned in Hellcrag.

Correct. Good thing she is hard to kill so I can’t be bothered. But you are right, where is this troop in the game?


This Troop releases in the next Hellcrag week (soon TM!)

In the meantime, if you have Chalcedony, she will summon Stone Mefyt, but you can’t collect Stone Mefyt from chests yet.