Crux, the Blood Dragon

Bleeding Body. When a creature attacks Crux and are within 5ft, will be sprayed with a burst of blood. The creature must make a DC 21 Con save, or be poisoned until the end their turn.

Blood Drinker. When Crux kills a creature with a vascular system, it immediately gains 20 temporary hit points, and has advantage for next attack rolls for a minute.

Blood Form. Crux may enter hostile creatures space, and may stop there.

Hemophilia. Wounds refuses to heal, a creature that has been poisoned by this Dragon require a long rest to regain any lost hit points.

Legendary Resistance (4/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Multiattack. The dragon makes one Bite attack, and two claw attacks and it may use Frightful Presence.

Bite. Melee Weapon Attack: +14 to hit; reach 10 ft., one target. Hit: 18 (2d10 + 7) piercing damage plus 7 (1d10) necrotic damage.

Claw. Melee Weapon Attack: +14 to hit; reach 10 ft., one target. Hit: 18 (2d10 + 7) piercing damage plus 7 (1d10) necrotic damage.

Tendrils of Blood. Dripping Tendrils burst forth from Crux's mouth; if the creature is Large or smaller, then they can be grappled. The creature must succeed on a 21 DC Strength save, or be grappled.

Harmful Breath (Recharge 5–6). The dragon exhales a cloying mist in a 5ft wide 60-foot cone from his maw. Each creature in that area must make a DC 21 Constitution saving throw, taking 57 (12d8) necrotic damage on a failed save, or half as much damage on a successful one. The ground under this cone is then covered in blood. Any creature attempting to cross this area, must succeed on a DC 21 Dex save roll, or fall prone at the end of their movement.

Frightful Presence. Each creature within 120 feet of Crux and are aware of him, must make a DC 18 Wisdom save throw, or become frightened of him for a minute. A creature can repeat the saving throw at the end of their turn. If a creature succeeds, or the effect ends, the creature is immune for the next 24 hours.

Bloodied Veil. (Recharged 5-6). In response to taking damage, a 10ft floating sphere of magical bloody mist forms. Any creature, other than Crux, with in this mist, must make a DC 21 Constitution save or take 20(4d8) necrotic damage on a failed save, or half on a successful save. The area is considered as heavily obscured for all creatures other than Crux, till the next turn. This effect lasts till the next recharge.

Blood Drain on a Grapple Creature. Crux gains half hit points from his necrotic damage.

The dragon can take 3 legendary action 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. Crux regains spent Legendary actions at the start of its turn.

Blood contortion(cost 1 action). The dragon attempts to control the blood of another creature with a vascular system within 120 feet of it that it can see. The creature must succeed on a DC 20 wisdom saving throw or be compelled to move up to 15 feet in a direction of the dragon's choice. During this movement the creature does not avoid hazardous terrain or threatened spaces.

Tail Attack(cost 2 actions). The dragon makes a Tail attack. (2d6+7) bludgeoning damaging. DC 19 Strength saving throw, or be knocked down and prone.

Wing Attack(costs 3 actions). The dragon flings necrotic - infused blood from its unfurled wings. Each creature within 15 feet of the dragon must succeed on a DC 22 Dexterity saving throw or take 14 (2D6+7) necrotic damage and become poisoned until the start of the dragon's next turn. The dragon can then fly up to half its flying speed.