redraw of Al! https://www.furaffinity.net/view/50317798/

I don't really think I shared much lore on him in the last one so I'll share some here
He's an undead demon, he gave up a piece of his horn and large chunk of his power for true immortality, his body can be destroyed an insane amount and will still be able to regenerate.
Though if he regains his horn, and reattached it, he would become super powerful but also lose the ability to regenerate, or alternatively if you stab him with his own horn it's an instant kill.