Hmm...would you mind editing out anything about Zeke that you have in your post...that's kind of a spoiler lol.
Yeah, I probably made it too hard haha. I actually did all the enemies stats, skills, etc. for the final dungeon (including the last boss) all like the day before I released my game, so it's possible that they are a little unbalanced. I tried my hardest though.
Okay, last boss. I would suggest having Damian, Glow, Leandra, and Zeth. Have Damian keep up Strength on Leandra, and have him also keep Faith and Agility on the whole party. Have Glow basically just constantly heal (use whole party healing) and OCCASIONALLY cast some light magic if you are like maxed out on health. Have Leandra either Berserk, or what I would suggest--have her use Holy Sword on whatever part you're focusing on. And for Zeth, either have him constantly nuke with either his strongest spells (but make sure Damian keeps Faith on him).
Now I would suggest focusing all your attacks on the arm that is putting status effects on you (I THINK it is the one on your right...but it's probably called left arm because it's HIS left arm...nm lol). Then take out the other arm which is casting the elemental magic on you. Then take out the head which is doing nasty regular attacks on your party. THEN take out the core, which really, by itself, is pretty weak. Just have Damian keep the buffs I mentioned earlier on everyone, and if no buffs are needed just have him use Slash on the part you are focusing on at the moment. You could have Zeth use his strongest multi-attack spell, but I would highly suggest having him nuke with one of his strongest single target spells (remember to keep buffs on!). Also, when you get status effects, I would suggest having the character with the status effects just use a Homeostasis Potion on himself instead of wasting someone else's turn doing it.
Actually, it would probably be a good idea to keep Ariana in your party in place of Leandra in my strategy, that way she can take care of the status effects instead of having to use items to do it.
You should be able to take care of him, if not...just level up I suppose. But try my strategy.
And yeah, please edit out the parts of your post that are spoilers...you know the ones lol.
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Character Synopsis uploaded! Check the first post.