Goblins XVIII: Being yourself can be dangerous

[Anteros]

For someone who was introduced as an unkillable abomination, Kore did lose a lot of his charm: he was tricked once with the rope, couldn't kill Forgath, was tricked again by Kin, the GAP soundly defeated him, and he doesn't even appear to be doing too well at dungeoneering, since he already fell through the roof once. By now, he is a problem only because he is the prison of Chief's soul, so the Goblins cannot evade him, but instead have to look for him and fight him to the bitter end (which would also save the village).

Well, the problem with unstoppable super villains that kill everything is that you can't really have your characters interact much with them without either killing your characters or worfing your villain.

Honestly, as portrayed Kore isn't that intimidating. If Minmax had just joined Forgath on the bridge instead of holding the gate they could have probably put him down.