There is a way to kill the skull eaters that I can't recall.

There is also a way to kill skull eaters that I can recall.

Get the geomancer and use the elemental attack on them. (I think it's pretty quick getting the Element ability so you don't always need a geomancer in your party)

There's a 2 out of 3 chance that the element attack will be a kind that does damage to the skull eater. You'll be rewarded 5 ABP points so it's worth it to kill the suckers.

I wish I could remember the other couple methods that I stumbled on... It might be sword dance, but I'm not sure. Either way, they only have 2, or maybe even 1 HP. The problem is getting rid of it.

Don't know how to kill Garkimasra. Musta never given me trouble because I can recall the name but nothing else. Keep at it, I guess. You'll figure out the techniques.