So there is an interaction in the game where Palpatine crackling doom deals damage to anyone who is shocked, and Jedi and rebels at the end of his turn. This deals damage is phrased in a way that it should synergize with the zeta Vader leader ability. However this interaction was removed from the game. According to the text in the offending skills, this is now broken, and not working as intended. Now that there is a bit more of a diverse meta and zeta Vader isn't really a huge thing in arena I believe this should be revisited. Please add to the bugs bin, as this interaction is not working as advertised.