Chrysalis Beast
a huge beast that the reborn Emperor Palpatine uses to guard his Citadel on Byss following his second reincarnation. They were created from the energy of the Dark Side of the Force, and grow in undergound chambers. They resemble rancors in shape, although they are much larger and have more humanoid characteristics. Palpatine unleashed the beasts when the New Republic launched a sneak attack on the Emperor's citadel using Balmorran Viper Automadons. The beasts were able to channel away the effects of the Vipers' weapons due to their attachment to the Dark Side, and easily destroyed the war droids and the Republic soldiers inside.