Fey Eye of Malevolence. As well as having the ocular powers of their ordinary kin, fomorian butchers can restrain opponents with a glance of their evil eye.
Obsessed with Slaughter. Fomorian butchers are among the most malign of their kind, obsessed with causing mayhem in battle and slaughtering foes.
Gullible Associates. Fomorian butchers are easily manipulated by beings who can exploit their desire for butchery.
Obsessed with Slaughter. The mind of a fomorian butcher is twisted and brutal. It derives pleasure from slaughter and bloodshed, loving nothing better than slowly chopping a living creature into mincemeat. Once it picks a target, often the most beautiful or athletic among a group of humanoid or giant opponents, the fomorian butcher becomes obsessed with hacking them to death. This fixation can be a weakness, as it often causes the butcher to neglect other dangers in its lust to cleave the chosen victim's flesh. A fomorian butcher keeps slaves like other fomorians, but these usually die quickly to the butcher's bloody whims. The commonest exception are trolls, who are a fomorian butcher's preferred slaves because they regenerate after being chopped up.
Yep - done and dusted. I cut out bit on trolls as I don't think it adds much and I could see some people finding it a bit gratuitously icky.
Also, its Evil Eye is a Bonus Action, not a Reaction.
Yes - changed to reaction and kept. I think I got everything