Different horns, there is a broken horn option, you can choose to have horns or not have horns, you can adjust the size and curves.

Having a flaming arm, like a magical prosthesis made of fla

And from AQW

It would also be nice if there was a parkour system like Assassin's Creed.

There may be a climbing skill, a skill that improves as you climb higher.

And the better your climbing skill l

Something like vampirism.

Racial Ability: Infernal demons drain x% of their enemies' health with each attack.