A confrontation, a duel, transpired within the Works involving Count Dooku, a one-time Jedi Master covertly allied with the Sith Master Darth Sidious, and the Jedi Master Yaddle. Yaddle, having tracked Dooku (who concealed his Sith activities under the alias "Tyranus"), to the location of the LiMerge Power building, found herself in a lightsaber duel with him, an encounter that ultimately led to her demise. Following this deadly confrontation, Dooku completely embraced the dark side of the Force, transforming into a Sith Lord and adopting the moniker Darth Tyranus.