Artorias the Abysswalker (5e Creature)
From D&D Wiki
Medium humanoid, neutral evil
Saving Throws Str +17, Dex +17, Con +17
Magic Resistance. Artorias has advantages on saving throws against spells and other magical effects.
Dark weapon. When Artorias hits with a weapon, the weapon deals an extra 6d8 necrotic damage(included in the attack).
Multiattack. Artorias makes three attacks with his Greatsword.
Greatsword. Melee Weapon Attack: +17 to hit, reach 15 ft., Hit: 39 (4d10+15) slashing damage, plus 30 (6d8) necrotic damage.
Deeper Corruption Artorias can allow the corruption of the Abyss to seep deeper into his bones, making him more powerful at the cost of his owns sanity. When Artorias hit points drop to 100 or lower, he gains a +10 bonus to attack and damage rolls, a +3 bonus to AC, and gets additional 20 ft. in speed per round. During this time, he has disadvantage on Intelligence, Wisdom and Charisma checks and saving throws.
Leap Attack. When Artorias is targeted by a creature within 30 feet, he can jump into the air, adding 2 to his AC against the attack, and land 5 feet within the attack. Artorias can then make an attack with his greatsword.
The can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The regains spent legendary actions at the start of its turn.
Greatsword. Artorias makes an attack with his greatsword.
Dripping Darkness(Costs 2 actions). The energy of the Abyss leaks through Artorias being, leaving a puddle in a 5 foot radius around him. Any creature that is in the puddle must make a DC 17 Dexterity saving throw, taking 40(8d6) necrotic damage on a failed save or half as much on a successful one. The puddle lasts for one round, after which it dissipates.
Once one of Lord Gwyn's greatest warriors, knight Artorias was the hero of Anor Londo. Now corrupted by the Abyss, he wanders Oolacile, attacking the few adventurers who dares to wander too close.