The Cauldron

The Cauldron was an arena located on the planet Rattatak. Dooku arrived there in 22 BBY to seek out an assassin for assassinating Anakin Skywalker. While he was there, he was led by the Henchman, and they were watching the gladiators fight to the death, the henchman was soon silently killed and Asajj Ventress replaced in the seat of the henchman, and soon went into the battle, killing everyone, even some of the owners, to prove she is worthy to become Dooku's assassin.