It is bugged or support has no idea what they are talking about
None of this matters if Bane is defeated
When Bane or other ally is defeated: The remaining ally gains 5% Critical Damage, Offense and Potency plus an additional 15% of these stats per the defeated character's Relic Amplifier level until the end of battle
While in Grand Arenas: At the start of battle if there is only one other non-Summon ally present and they are Sith:
- Bane gains 75% Mastery, Max Health, and Max Protection
- Whenever an enemy is defeated, Bane gains 10% Max Health, Max Protection, and Offense (stacking) until the end of battle
- At the start of battle, Bane takes a bonus turn
So the statement:
These effects persist if Bane is defeatedDoesn't matter for that entire portion of his ability
So that only leaves
they gain an additional 2% Ultimate Charge, and the following effects occur for Bane and other Sith ally:
- Immune to Ability Block, Cooldown Increase, Healing Immunity, Stun, and Turn Meter reduction
- Gain 75% Max Health
- Gain 75% Max Protection until the first time they are defeated
- Ignore Taunt effects
- At the start of their turn, recover 35% Protection and dispel all debuffs on themselves