Weeping Angel

Don't Blink. The Weeping Angel is visually indistinguishable from a statue when visually observed by one or more creatures. Magical sight such as that granted by Arcane Eye or Scrying does not trigger this trait.

While in statue form, the Angel cannot move and automatically fails any Dexterity save it must make. Its Armour Class becomes 23, and it gains Immunity from Cold, Fire, Lightning, Poison, Necrotic, and Radiant damage, as well as Immunity from Bludgeoning, Piercing, and Slashing damage from weapons that are not made of adamantium. It can only take an action to cast Darkness.

Any creature with an Intelligence score of 6 or greater that can see the Angel and is within 60-feet of it can choose to fully focus their attention on observing the Angel until the start of the creature's next turn, so long as they have not acted yet in the round of combat. While focusing this way, the creature is considered Blinded to everything except the Angel, cannot take other actions, and gains advantage on Wisdom saving throws against this trait.

Whenever a creature takes an Action other than a Bonus Action or Reaction within 60-feet of the Angel while the Angel is within their line of sight, all creatures within 60-feet of the Angel and within the Angel's line of sight must make a DC15 Wisdom saving throw to avoid blinking or otherwise briefly losing sight of the Angel. If no creature succeeds this saving throw, the Weeping Angel may immediately use its Impossible Movement as a Reaction before the triggering action resolves. Blinded creatures, creatures that are fully facing away from the Angel, and creatures that have attacked a target other than the Angel this round automatically fail this saving throw.

Image of An Angel. At the start of the Weeping Angel's turn, it can attempt to force all creatures within 60-feet of it to avert their gaze until the end of its turn. Through great mental effort, creatures with an Intelligence score of 6 or greater may choose to attempt a DC15 Wisdom saving throw to resist this effect. On a successful save, the creature does not avert its gaze but suffers 13 (4d6) points of Psychic damage.

Innate Spellcasting. The Weeping Angel can cast the following spells innately, without requiring components.
2/day: Darkness.

Speak Through Dead. The Weeping Angel can manipulate the consciousness of a creature it killed and use it to communicate. The Angel gains the ability to speak all of the languages the creature knew in life, and can perfectly imitate its voice.

Multiattack. The Weeping Angel can make three attacks with its Claw attack.

Claw. Melee Weapon Attack. +10 to hit., reach: 5 ft., one target. Hit: 21 (3d8 + 5) points of Slashing damage.

Banishing Touch (Recharge 5 - 6). Melee Weapon Attack. +10 to hit., reach: 5 ft., one target. Hit:  60 (10d12) points of Necrotic damage. The target must succeed on a DC16 Constitution saving throw or be banished to a Plane of Existence of the Angel's choosing. A creature can repeat the saving throw at the end of each of their turns to end this effect. 
If the Angel has been reduced below its hitpoint maximum, each time a banished creature fails its saving throw at the end of their turn, the Angel consumes two of the available hit dice of that creature, and is healed for that amount of hitpoints. A creature who has all of their available hit dice consumed by the Weeping Angel suffers immediate death, and the Angel heals for the total number of hitpoints that creature possessed at the time of their death.

Impossible Movement. If the Weeping Angel is unobserved, it can teleport along with any equipment it is wearing or carrying up to 80-feet to an unoccupied space it can see. Before or after teleporting, the Angel can make one attack. If the Angel has not used the entirety of its Impossible Movement by the end of its turn, it can chose to return to its original position if it is 40-feet away or less, or move to any unoccupied space it can see within 40-feet. This is not considered magical.