I had an interesting idea regarding the villain of this story. If it’s Mangog then It would be pretty ingenious to have him communicate through telepathy. We really haven’t had something like that before. It would be such a cool, fresh and intriguing angle which would add so much more layers to Thor’s character as well since he’s battling with himself in AEG and that could kind of creep up on him once again.
Mangog is basically a hateful and juiced up monstrous version of the Juggernaut. Mangog in terms of being able to ditch and take damage, should be similar to Kurse... but much more imposing and scary.
Adding telepathy gives the character of Mangog a more layered and also smart look at him other than just being a weapon of mass destruction. His telepathy could be use to create a more intimate duel with Thor, getting into his head and messing with him while also being a basically unstoppable physical being. Hence the need for more characters to join the fight and help Thor snap out of it and battle an adversary of pure hatred.