Abyss Demon is a melee attack ground hero with Warrior class mercenaries. His skill is a strong healing type.
Abyss Demon’s heal skill comes directly from the amount of DMG he does during attacks. It is greatly beneficial to use ATK, DMG, and/or ATK Rate boosting aids and talents. He is most useful when attacking targets with a significant amount of HP such as those in Battle Royale and Guild Clash.
The best equipment to use with Abyss Demon is the Thunder Blade. This is because the lightning DMG from the Thunder Blade counts towards Abyss Demon’s healing if his skill is active when the lightning procs.