Fun fact: Ketheric Torm is a level 11 undead and doesn't have the same ability as the skeleton in our camp. It seems to me that this was done on purpose and there should be some content there for those who decide to check, Larian can give him level 12 or resistance to control over undead, but he is level 11 without this ability
Technically, is it possible to gain enough experience to reach level 12 by the time you meet Ketherick? Especially when he's invulnerable.
This would allow the protagonist to take control of Myrkul's chosen one and add him to the party as our servant. Incredible thing to break the game and the plot
An interesting idea, but I don't think it's possible to get lvl 12 in act 2, even if you murder hobo everyone for exp. I generally do everything there is to do and am lvl 10 by the time of his Apostle fight. Maybe if you murder hobo'd everyone, so the Grove, Last Light, Myconids you might get to lvl 11. But 12 is just not possible without mods.