Ghromar is a sentient and very strange armor piece, rumored to be part of a hivemind-like creature. His tendrils are a little grabby, so look out for them...
(Ghromar, Grasp of the Void has a unique texture in the official Vox resource pack)
Sentient items level up as you use them, increasing their stats, enchantments, and attributes, starting at level 1 and maxing out at level 50.
They also whisper to you and have unique personalities. This is truly a one of a kind armor piece.