Darth Bane character idea

Darth Bane - Sith/Tank

Leader: The Rule of Two
At the start of the encounter Darth Bane gains a non-dispellable buff MASTER, and one random sith ally gains a non-dispellable buff APPRENTICE.

The MASTER buff grants %50 offense, %10 health and %10 protection.

The APPRENTICE buff gives %5 speed and critical chance, and stacks up to 10 times. Whenever the APPRENTICE uses a basic attack, special ability, or is called for an assist, gain 1 additional stack.

If the APPRENTICE is killed while Darth Bane is alive, another random sith ally gains 1 stack of APPRENTICE. If Darth Bane is killed, all APPRENTICE buff stacks are dispelled, and replaced with the MASTER buff.

Basic: Dark side assault
Deal physical damage to a target and inflict two damage over time effects. Call an ally with the APPRENTICE buff for an assist.

Special 1: Orbalisk Armor
Gain taunt, retribution, and defense up for 2 turns. Allied with the APPRENTICE buff gain %25 turn meter.

Special 2: Dark Tutilage
Deal physical damage to a target. Allies with the APPRENTICE buff are called for an assist, deal %50 more damage and gain %25 turn meter.

Thoughts?