Pay 1500 LP and declare 1 Monster Type and Attribute; your opponent must send 1 face-up monster with the declared Type and Attribute from their field to the GY, if possible. For the rest of this turn, your opponent cannot activate the effects of monsters with that sent monster's name. You can only activate 1 “Herald of the Abyss” per turn.
Herald of the Abyss has an improved version of Cyber Angel Dakini’s effect but with the added benefit of being able somewhat specify what monster your opponent chooses while also negating the sent monster’s effect. However Dakini does have the advantage of not needing to pay LP and being stuck on a strong monster.