Hellfreak torments his way through Teleria and joined the Demonspawn faction as part of Patch 4.50. Hellfreak will likely be a champion required to fuse the August 2021 Fusion – Mother Cybele.
Hellfreak has some niche uses with the ability to Swap HP with an enemy, and some buff stealing but he is all single target so may prove difficult to use in your team with a really low base Def. He does have an incredibly fast base speed. He may have some niche uses.