Crimson Watcher

Watcher's Speed. It cannot be hit by ranged attacks. 

Photophobia. When day rises, it will flee underground, even if it is in a battle. It moves very quickly. 

Rage State. When it drops to 50% health, it can no longer perform normal actions. It can now perform legendary actions.

Sanguinary Sight. Reach 20 ft., three targets. Inflict blinded

Echo Form. Melee Weapon Attack: +2 to hit, reach 15 ft., one target. Hit: 14 (2d12 + 2) piercing damage. 

Tears of Blood and Pain. Ranged Weapon Attack: +1 to hit, range 60/20 ft., one target. Hit: 5 (1d4 + 1) acid damage, 5 (1d4 +1) necrotic damage. 

In the Eyes of the Beholder. Inflict the attacker with frightened. The attacker must roll a dexterity saving throw of 15 or take a 1d4 necrotic damage and be inflicted with blinded.

When the sanguinem vigil reaches 50% health, it can no longer use normal actions and instead performs these actions. 

Charge of the Crimson. Melee Weapon Attack: +4 to hit., reach 30ft, one target. Move 30ft forwards. Hit: deal 14 (2d12 +2) piercing damage. Deal 10 piercing damage to anything within 5ft to the original target.

Hunger’s Strike. Melee Weapon Attack: +1 to hit., reach 15ft, one target. Hit: Inflict grappled, deal 5(2d4 +1) slashing damage. Every time it is the sanguinem vigil’s  turn, the grappled target must roll a strength roll of 15 or take 5 slashing damage. Only one target can be grappled at once.