Innate Spellcasting. The Ag'draron's innate spellcasting ability is Charisma (spell save DC 14). It can innately cast the following spells, requiring no material components:
At will: disguise self, armor of agathys
Spellcasting. The Ag'draron is a 10th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 14, +6 to hit with spell attacks). It regains its expended spell slots when it finishes a short or long rest. It knows the following warlock spells:
Cantrips (at will): thunderclap, chill touch, sword burst, toll the dead
1st–5th level (2 5th-level slots): arms of Hadar, blight, counterspell, crown of madness, darkness, dimension door, dispel magic, fly, hold monster, invisibility
Turn Resistance. The Ag'draron has advantage on saving throws against fear and charm effects.
Rending Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (4d6 necrotic damage).
Abyssal Bolts. Ranged Spell Attack: +6 to hit, range 120 ft., one or two targets. Hit: 12 (3d8 + 2) necrotic damage. If the target is Large or smaller, it must succeed on a DC 15 Strength saving throw or become restrained as shadowy tendrils wrap around it for 1 minute. A restrained target can use its action to repeat the saving throw, ending the effect on itself on a success.
Description
An Ag'draron is a demon which specialises in making pacts with those who seek revenge and feel a lot of rage. They will lend powers to these creatures, with the promise that they can seek for revenge, and in meantime it hopes to corrupt the mind of the mentally weakened creature to turn it into a mindless chaotic killer.
The Ag'draron resides within the person, much like with a possession, but it can not control the creature directly or take over its will. Instead it will sow seeds of corruption and paranoia in its mind.
The possessed creature must willingly release the Ag'draron out of its body, which is easier said than done after days of seeding paranoia. The longer the demon possesses the creature, the higher the DC will become for others to convince the possessed creature to release the demon, until eventually it will become impossible, and the only thing that's left to do is killing the creature itself, upon which the demon will become separated from the creature, but is still unharmed.
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