When your build step starts, you may put 1 corruption counter on a unit with 1 or more counters of any type on it in the Ground or Character arena.
Whenever one of your unique Triumvirate Sith causes a unit to be discarded, you may pay 1 Force. If you do, take 1 40/2/2 Elith Sith Assassin Subordinate with "Stealth" and "Pay 1 Force Ambush 2" and put it into the Character arena.