Vastator

Vastator was the Borg designation for Daimon Turane who was the Ferengi captain of a marauder. He was assimilated while on a Borg Cube and served as the spokesperson much like Vox and Locutus did.

He was killed by Jean-Luc Picard while on the Doomsday machine planet killer.

(Star Trek novel: Vendetta)