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Thaneborn Triumph: You gain the roar of triumph
power. In addition, whenever you bloody an
enemy, the next attack by you or an ally against that
enemy gains a bonus to the attack roll equal to your
Charisma modifier
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Roar of Triumph Barbarian Feature
Your howl of victory shakes your enemies to the core, as they
know your blood thirst is not yet quenched.
Encounter ✦ Fear, Primal
Free Action Close burst 5
Trigger: Your attack reduces an enemy to 0 hit points
Target: Each enemy in burst
Effect: Each target takes a –2 penalty to all defenses until
the end of your next turn.
Those two bits right there make them secondary leaders. I don't think that AC or to-hit debuffs are necessarily controllery. AC debuffs for instance are basically the same as to-hit buffs, its leader territory. Forced movement, status effects, area denial, and the like are controller territory.