Arthorius Clover, Raven Queen's Champion

Raven's Venom. This sowrd was blessed by the raven queen and thus it is made to fit its wielder in a way appropriate to it. The sword has the stats of an greatsword but can take the form of any other sword. In additon it deals an extra 1d6 necrotic damage. But only the champion of the raven queen is able to wield this sword.

Defens. While Arthorius is wearing armor, he gains a +1 bonus to his AC.

Legendary Resistance (3/Day). If Arthorius fails a saving throw, he can choose to succeed instead.

Divine Smite. Arthorius can expend one spell slot to deal an additional necrotic damage. The damage is determined by the spell slot used. At 1st-level the damage is 2d8 and increases for 1d8 for each level above 1st to a maximum of 5d8 (4th-level spell slot).

Spellcasting. Arthorius Clover is a 20-level paladin spellcaster. His spellcasting ability is Charisma (spell save DC 19, +11 to hit with spell attacks). He has following paladin spells prepared:
1st level (4 slots): Bane, Shield of Faith, Command, Healing Word

2nd level (4 slots): Gentle Repose, Blindness/Deafness, Zone of Truth, Hold Person

3rd level (3 slots): Speak with Dead, Feign Death, Remove Curse, Revivify

4th level (3 slots): Blight, Banishment, Death Ward, Staggering Smite

5th level (2 slots): Antilife Shell, Raise Dead, Dominate Person, Hold Monster

Multiattack. Arthorius makes two Raven's Venom attacks.

Raven's Venom. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 14 (2d6 + 8) slashing damage, plus 1d6 extra necrotic damage.

Avatar of Death. Arthorius can use its action to take the form of th raven Queen's Champion Avatar form. The transformation lasts for 1 minute and while transformed he gains the following abilities:

• His clothes and equipment become dark almost black, his eyes become glowy white and a pair of black wings sprout from his back granting him a fiying speed of 60 feet.
• His attacks inflict an addition 2d8 necrotic damage.
• His transformation makes all his enemies recognize in him death itself, to a point that they can actually see it. The first time any enemy creature moves within 30 feet of him or starts its turn within 30 feet of him, the creature must succeed on a Wisdom saving throw or be frightened for 1 minute or until it takes damage. Attack rolls against the frightened creature are made with advantage.

Shove. If Arthorius is attacked with a melee weapon attack he can make an Athletics check contested by the target’s Athletics or Acrobatics check to shove it away. If he wins the contest, the target is pushed 10 feet away from him. Arthorius then can make a melee weapon attack with his Raven's Venom.

Arthorius can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. He regains spent legendary actions at the start of its turn.

Raven's Venom Attack (1 Action). Arthorius makes one melee weapon attack with his Raven's Venom. 

Spell (2 Actions). Arthorius casts one of his spells.

Swarm of Ravens (3 Actions). Arthorius slams his shield on the ground causing it to emit black smoke. Out of the smoke dozens of ravens come out to aid Arthorius in his battle. The swarm surrounds a target Arthorius can choose and while sorrounded the target is blinded and immediately takes 4d10 necrotic damage as the ravens pierce into its soul. At the start of its turn it takes another 4d10 necrotic damage. The creature can us its action to make a DC 19 dexterity saving throw to escape them. Arthorius can then command the swarm to surround another creature as a bonus action. The swarm lasts until dispelled from him as a free action or until they are killed. They have an AC of 13 and 6d6+36 HP.