Sith allies gain 60% Offense and 150% Health Steal. Sith allies lose all Protection and gain that much Max Health. Sith allies are immune to Healing effects that aren't Health Steal and can't score Critical Hits.
Lord of Hunger
At the start of each of his turns, Nihilus inflicts Damage Over Time for 2 turns on a random enemy that doesn't have any debuffs. If all enemies are debuffed, inflict Damage Over Time on a random enemy. At the start of each enemy turn, Nihilus inflicts Health Down on them for 2 turns. When allied Darth Sion or Darth Traya are inflicted with a debuff, Nihilus gains 10% Turn Meter and +30% Max Health (stacking) until the end of the encounter.