The Hero Returns - Vol. 1 Ch. 16

[MangaDex]

 

[NerdySasquatch]

A cyclops with a second eye in the hand..... is it worth two in the bush? No no.

I'm surprised he thought it'd kill it. Stabbing a hand nor eye are fatal so unless it's heart is in that hand-eye than it wouldn't be.

Perhaps whatever deity is responsible for monsters was informed about hand-eye coordination and took it waaay too literally. Ok ok enough dad jokes I'm done.

 

[Moridin69]

Other hand maybe? I assume it being a weak point means its lethal (or nearly so) to hit it, at least with yellow level enemies.