Demon of the Abyss

Demon of the Abyss
The Demon of the Abyss is technically a post-plantera dungeon miniboss, but it isn't. With high health, damage and insane vertical speeds, the Demon of the Abyss will chase you through the howling halls of the Hardmode Dungeon. The Demon of the Abyss is made from Abysmal Shadowflame, and is more than delightened to share it with you with infernal orbs and lots and lots of death.

Dispatching the Demon of the Abyss as quickly as possible should be your priority, and whatever you do, try to avoid dodging upwards or downwards as the Demon can catch up even faster that way.

AI
The Demon of the Abyss follows a simple AI pattern. It follows the player and passes through walls, slowly trailing Shadowflame as it creeps and if the player chooses to escape vertically, gain a sudden burst of velocity. It is very easy to spot, as it's essentially a living mass of Shadowflames, and the Shadowflames glow through walls. While it chases the player and is in range, it will fire Shadowflame orbs that are unblockable and affected by gravity.

Just like every other Abyss enemy, it drops Dissonance upon defeat, which is required for various items and the Abysmal Duo summoning item.