Mission to Serenno

"What sorcery is this?"

- Darth Tyranus

This mission took place in 21 BBY on Serenno after Darth Sidious ordered his apprentice, Darth Tyranus, to kill Asajj Ventress. When Ventress survived she wanted revenge and looked to her fellow Nightsisters for aid. Taking Karis and Naa'leth to Serenno, Ventress attempted to assassinate Tyranus, but the Sith Lord repelled the attack, defeating his assailants.

The mission
Asajj Ventress and the two other Nightsisters became invisible and, using Jedi lightsabers, infiltrated Tyranus's palace. Ventress shot a poison dart into Tyranus's neck and blinded him, however he could still sense them through The Force. The duel started in the Count's bedroom and led into his office. Ventress managed to disarm the Sith Lord and was about to strike the killing blow, but Tyranus struck Ventress and her accomplices with Force lightning, and threw them out the window and over a cliff, ending the attack. However, the three Nightsisters survived and returned to Dathomir.

Afermath
"Where one sees failure, others see opportunity."

- Mother Talzin Due to his attackers' use of Jedi lightsabers, Tyranus believed that the Jedi had tried to assassinate him, and, wishing to protect himself, sought a new apprentice to replace Ventress (whom he erroneously believed to be dead).

Given the failure of their direct attempt to kill Tyranus, the Nightsisters developed a new plot to kill the Sith Lord using a double agent. To arrange the plan, Mother Talzin contacted Tyranus, offering to provide one of the Nightbrothers to be his new assassin, and Tyranus agreed. After selecting Savage Opress to be their pawn, Talzin presented the hulking Zabrak to Tyranus, who was pleased with his new warrior, unaware of his true loyalties.