Balphazar

Step through shadow: if the creature is within dim light and not restrained or incapacitated they can teleport between shadow 30ft apart

Fire restistance: the creature wears plate armour of fire restistance 

Drink deep:when using the bite attack on a creature heall 4d6+ con mod

Bat form: as a reaction the creature can transform into a greater bat swarm flying speed 60 ft

Life sense: the creature can see the blood with in a creature by concentrating for 1 min

Drain life: whenever the creature hits with an attack the creature regains hit points equal to half the damage dealt

Spellcasting.

Save dc: 18 spell attack mod: +7

At will

Control fire

Shape water

Mindsliver

1st level 4 times a day

Shield

Witch bolt

Charm person

2nd level 3 times a day

Darkness

Blur

Phantasmal force

3rd level 3 times a day

Lightning bolt

Dispel magic

Hypnotic pattern

4th level 2 times a day

Greater invisibility

Blight

Vitriolic sphere

Action Name. Multi attack: balphazar makes 3 blood sword attacks any of which can be replaced with the flying sword or bite

Melee attack: bite: +5 to hit. Reach 5 feet, 1 target, hit 4d6+4 necrotic damage this damage can not be resisted and balphazar gains that many hit points

Action Melee Attack. Blood sword +8 to hit, reach 5 ft., # target. Hit: 10(2d6+ 8) [necrotic and slashing damage. 

Flying sword: range attack: +6 to hit, range 30ft, hit: 2d6+7 half slashing damage and half necrotic damage

Reaction Name. Greater bat swarm. Balphazar turns into a greater bat swarm and moves 60ft in any direction

Starts with 3 legendary actions

1. Make an attack action with the blood sword

2 step through shadow

3 cast a spell for frew