Magic Resistance. The echo has advantage on saving throws against spells and other magical effects.
Wakeful. When one of the echo's heads is asleep, its other head is awake.
Multiattack. The echo makes two Tentacle attacks.
Tentacle. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit:13 (2d6 + 6) bludgeoning damage plus 9 (2d8) necrotic damage.
Discordant Screams. The echo directs its frenzied howls at one creature it can see within 60 feet of itself. The target must succeed on a DC 13 Wisdom saving throw or suffer one of the following effects of the echo's choice:
No transformation wrought by the hand (or tentacle, whatever) of a demon lord is rightly understood as a "blessing."