Azzoth

Azzoth, the demon of hate. Has recently grown in strength after being imprisoned in a jungle temple, able to manifest physically after feeding off the hate of a very strong force in the area…

Boone stumbled upon him in the jungle and Azzoth has been inhabiting his head, encouraging him towards hate and to commit dreadful acts.
He eggs him on constantly, and even grants him a small amount of power when Boone is in his vicinity. When Boone killed his father the overwhelming hate allowed Azzoth to manifest. Azzoth feeds off of Boones hate and does what he can to protect him since he is a source of power, and grants him some power in return. (Enhanced abilities, resistance to damage, etc?)
"i feel like at the beginning when boone doesn’t know what’s happening he’s like mad at azzoth and trying to tell him off but az doesn’t go away and it’s like a hate love relationship but then it turns into a hard core love relationship" -Newtybabe/Kit