Normally when you have an Ogre with 9k hp, 400 damage, fast attack speed, over 20 armor, immunity to magic and he doesn't take even 1 damage from a purificator cannon blast as your ally, there is absolutely no way you can end up in the same situation as the first book.
That ogre was no mere ogre. It was the Ogre God given a physical form so that mortals of Arkain could bask beneath his might!
Oh, so you think you are invicible because you have the powerful elven magic, the unholy magic of the undead taught by Aridon himself, Hamos and his entire order of mages and Brian's shadow magic? Well, you thought wrong, because none of those things can do a damn thing to this physical deity!
The cannon is basically Arkain's version of a nuke and it doesn't do a damn thing!
Killing him should be the MAIN mission, because even demon lords are child play compared to him!