Black Venom(Kragmar's Vessel)

Living Shadow. While in dim light or darkness, the dragon has resistance to damage that isn’t force, psychic, or radiant.

Shadow Stealth. While in dim light or darkness, the dragon can take the Hide action as a bonus action.

Amphibious. The dragon can breathe air and water.

Legendary Resistance (5/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Arcane Armor. Immune to spells 5th lvl and lower even upcast spells.

Multiattack. The dragon makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +21 to hit, reach 15 ft., one target. Hit:  (5d10 + 16) piercing damage plus  (5d8) necrotic damage.

Claw. Melee Weapon Attack: +21 to hit, reach 15 ft., one target. Hit:  (5d8 + 16) slashing damage.

Tail. Melee Weapon Attack: +21 to hit, reach 20 ft., one target. Hit: (6d12 + 16) bludgeoning damage.

Shadow Breath (Recharge 3–6). The dragon exhales shadowy fire in a 60-foot cone. Each creature in that area must make a DC 27 con saving throw, taking (20d8) necrotic damage on a failed save, or half as much damage on a successful one. A humanoid reduced to 0 hit points by this damage dies, and an undead shadow rises from its corpse and acts immediately after the dragon in the initiative count. The shadow is under the dragon’s control.

Hybrid Breath (1/Day)The dragon exhales shadowy Acidic fire in a 60-foot cone. Each creature in that area must make a DC 27 con saving throw, taking (20d8) \(16d8) necrotic and acid damage on a failed save, or half as much damage on a successful one.

while in dim light or darkness the dragon can teleport up to 60ft as a bonus action.

Has 2 reactions per round.

Can nullify one spell cast within 60ft.

Reflect one attack onto attacker.

The dragon 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 dragon regains spent legendary actions at the start of its turn.

Detect. The dragon makes a Wisdom (Perception) check.

Tail Attack. The dragon makes a tail attack.

Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 15 feet of the dragon must succeed on a DC 24 Strenght saving throw or take 23 (5d6 + 8) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.

Acid Breath (Costs 3 Actions)The dragon exhales acid in a 90-foot line that is 10 feet wide. Each creature in that line must make a DC 27 Dexterity saving throw, taking 67 (16d8) acid damage on a failed save, or half as much damage on a successful one.

Once below half health can perform mythic actions

Arcane surge spells nullified are fired back at the caster.

Takes control of a creature for 1 round after it effects player they are immune to this effect for 24hrs.