Azraelum, the Whisper of Demons

Mage Slayer.

• When a creature within 5 feet of Azraelum casts a spell, Azraelum can use his reaction to make a melee weapon attack against that creature.
• When Azraelum damages a creature that is concentrating on a spell, that creature has disadvantage on the saving throw it makes to maintain its concentration.
• Azraelum has advantage on saving throws against spells cast by creatures within 5 feet of him.

Sentinel. 

• When Azraelum hits a creature with an opportunity attack, the creature's speed becomes 0 for the rest of the turn.
• Creatures provoke opportunity attacks from Azraelum even if they take the Disengage action before leaving his reach.
• When a creature within 5 feet of Azraelum makes an attack against a target other than him (and that target doesn't have this feat), you can use his reaction to make a melee weapon attack against the attacking creature.

Arcane Deflection. When Azraelum ishit by an attack or fails a saving throw, he can use his reaction to gain a +2 bonus to his AC against that attack or a +4 bonus to that saving throw.When he uses this feature, he can’t cast spells other than cantrips until the end of his next turn.

Tactical Wit. Azraelum can give himself a bonus to his initiative rolls equal to his Intelligence modifier (+2).

Spellcasting. Azraelum is a 3rd-level spellcaster. His spellcasting ability is [intelligence] (spell save DC 13, +5 to hit with spell attacks). Azraelum has following [wizard] spells prepared:
Cantrips (at will): [green-flame blade], [lightning lure], [mending]
1st level (4 slots): [absorb elements], [magic missile], [shield], [sleep]

2nd level (2 slots): [misty step], [web]

Azurath.  Creatures struck by Azurath, take an additional amount of force damage equal to the level of the highest spell slot they currently have. 

Multiattack. Azraelum makes 3 azurath attacks, or one azurath attack and a cantrip casting. 

Azurath. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 11 (2d6 + 6) [slashing] damage. 

[Misty Step]

Arcane Deflection. When Azraelum is hit by an attack or fails a saving throw, he can use his reaction to gain a +2 bonus to his AC against that attack or a +4 bonus to that saving throw. When he uses this feature, he can’t cast spells other than cantrips until the end of his next turn.

Parry. Azraelum adds 6 to his AC against one melee attack that would hit him. To do so, the he must see the attacker and be wielding a melee weapon or shield.

[Absorb Elements], [Shield]