Amora's Links
Even though that Diablo was brutal, savage, beast (still can be) she was the only angel that wanted to give him a chance to change.
After she shoot him with her arrow of feelings, she helped him to understand to the new feelings that he has never felt before.
Amora is the only angel that Diablo trusts and is willing to listen.
She was the only angel that was willing to give him a chance and helped him to change after he was hit by her arrow of feelings.
Diablo wasn't very happy about the whole situation but by time he started to tolerate her and maybe even liked her...