Weeping Angel

Time Locked. When it is being observed it is stuck in place and made out of very strong stone, too strong to destroy with most attacks, even when destroyed after some time it will become whole again. When it is not being observed it can use its attacks.

Corpse Speak. Can steal the voice of a dead person. It will also get the memories of the person.

Snuff Light. Can snuff out any light source.

It Is What  You See. Any image of a Weeping Angel is a Weeping Angel. 

Aging Touch. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) necrotic damage and the Angel regains hit points equal to the damage done. The targets maximum hit points are lowered based on the necrotic damage done and the character ages a number of years equal to the damage of the attack. The lost hit points are restored after a long rest but the additional years of age can only be restored by a greater restoration spell or similar magic. Each time a character suffers a aging touch that takes them above a venerable age (e.g. 70 with humans) they gain a level of exhaustion and after gaining 6 levels the victim dies and turns to ash.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d10 + 2) slashing damage.

Skin of Stone. When a creature makes a non-magical attack against you, they take must make a strength saving throw (DC 15). On a successful roll they take half the damage they dealt to you. On a failed roll they take the full damage. 

Time Feed. If it is actively touching a creature it will send it back in time 1/3 of the creatures average lifetime, if the creature is in the party and has not died of old age a letter will be delivered to the party. If the creature is in the party and has died of old age then a letter will be delivered to the party informing them of their deceased friend delivered by the characters child, the child will have the same skills and equipment as the deceased character.