Bloodmage Neivez Ord-saleg

Multiattack. Neivez makes two Thirsting Claw attacks.

Thirsting Claw. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 9 (1d6 + 6) slashing damage and Neivez gains 6 temporary hitpoints. If this attack reduces a target to 0 hitpoints, Neivez also regains 14 (4d6) hitpoints. 

Clot. A blood-tethered target must make a DC 17 Constitution saving throw or have their movement speed set to 5 feet until the end of their next turn.

Bloodcurse Breath (1/day). Neivez inflicts 2d8 damage upon himself to unleash an empowered breath of flame, laced with cursed blood. All creatures in a 30 foot cone must make a DC 17 Constitution saving throw or take 7 (2d6) fire damage plus 7 (2d6) necrotic damage, becoming cursed on a failed save. A cursed target takes 2d6 necrotic damage every time they make an attack or cast a spell or cantrip. A saving throw to end the effect may be made at the end of a cursed target's turn.

Blood Tether. Neivez produces a tendril of boiling blood that latches on to a target of his choice within 60 feet. Any damage he takes (except psychic, radiant, and necrotic) is halved, as the other half is shared by his blood bound target. The tether has an AC of 22 and 30 hit points, and it is immune to all damage types except for radiant, lighting, and force damage. This requires concentration from Neivez, and anytime he takes damage, he must make a DC 11 Constitution saving throw to maintain the effect. Alternatively if he takes more than 11 damage at a time, the DC is equal to the damage taken. Neivez cannot choose the same target twice in a day. If the target is more than 200 feet away, or blocked off such that no liquid can seep to their location, they are temporarily unaffected. The effect only ends if Neivez loses concentration or the tether is destroyed.

Wings of Ivolsir. Neivez gains a flying speed of 60 feet for 1 hour.

Invoke Pain. When a creature misses Neivez with an attack,  he may choose to be hit instead. Doing so inflicts full damage to his tethered target, rather than half.

Neivez has 2 legendary actions per round. At the end of an ally's turn, Neivez may use this action on them:

Mortal Favour (Costs 1 Action). Neivez deals 30 necrotic damage to a willing ally and regains hitpoints equal to the damage dealt.

Sanguine Puppetry (Costs 1 Action). Neivez commands a blood bound target to use its reaction to move up to half its movement speed (without provoking opportunity attacks) towards a target of his choice and make a melee attack against them.