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Warlord's doom
Warlord 27

You break your adversary’s resolve with a ferocious strike.

Target: One creature

Hit: 4 [W] + Strength modifier damage, and until the end of your next turn, you can choose an effect currently on the target. The target fails its next saving throw against that effect.

Inspiring Presence: "The bonus equals 1 + your Charisma modifier.[PH:152][Dr397:24]

CharOp Evaluation: Great[Char-op Warlord]

Making an enemy automatically fail a specific saving throw is an extremely strong effect, especially after the errata for the Orb Wizard limited their ability to also do so. Becomes even stronger if someone in your party has a Stun or Daze that is save ends.