Artorias of the Abyss

Unwavering. Artorias is immune to being [Tooltip Not Found].

Abyss Touched. Artorias is protected by abyssal powers, making him resistant to none-magical attacks

Multiattack. The knight makes two melee attacks.

Greatsword. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d8 + 3) slashing damage.

Leap of death. Melee Attack: +5 to hit, range 15/20 ft., one target. Hit: 10 (3d10) damage.

Dark Sludge.  (NOT MELEE) Artorias uses his broken arm to throw black sludge in an cone of 15 ft. Can be aimed to be 5 ft. or 10 ft. from him. Any being hit by the throw is to make a DEX saving throw, DC 14, to half the damage and take no effect. Any character hit takes 2d8 damage and has no reaction until their turn.

Abyssal Cry. Once surrounded, by at least 2 sides, Artorias can use his reaction to start a large scale attack. He will have to charge it, and will need to keep concentration for at least 3 enemy turns before it can be activated. For each turn of an attacking enemy, on the FIRST hit of the turn, Artorias must roll a CON save to keep his concentration of the Cry.
CON save minimum for the first attack: 10 ; Second attack: 11 ; Third: 13 ; Forth: 15 ; Fifth: 17.
If the attackers don't brake his concentration on the Cry, on the next turn from the counting Fifth possible attacker, Artorias Cries a painful bawl and releases a large scale attack of Abyssal power, covering an area of 30 ft. from him as center.
Anyone caught in the blast will have to make a CON save with a minimum of 15 to pass and receive half damage.
The attack will deal 4d6 to any being caught in the zone, +8 damage to anyone right next to Artorias when the attack releases.
Artorias is unable to use any other reactions when holding the Abyssal Cry concentration.