Other effect
Duel
The Duel effect is placed on the producer and their target. When the Duel effect is active, the producer can use any skill against the target, while the target is limited to only using their default skill against the producer, similar to the Provoke debuff.
The producer deals 50% more damage to the target under the Duel effect. Champions not under the Duel effect deal 50% less damage to targets who are in a 'duel'.
To end the 'duel', Champions must deplete the producer's Duel bar. This bar is equal to 0.5% of the producer's MAX HP. Once the requisite damage is dealt, the Duel effect is removed from all Champions. If the producer or their target dies while under the Duel effect, it is also removed.
The Duel effect has priority over Taunt, Veil, and Perfect Veil buffs. For example, the producer of the Duel effect will always target the enemy under the Duel effect, rather than a Champion under a Taunt buff. If the target of a Duel effect is under a Veil or Perfect Veil buff, they will still be targeted by the effect's producer.
The Duel effect is placed irrespective of the number of the debuffs currently on a target Champion. The Duel effect is guaranteed, and cannot be removed, resisted, stolen, spread, or blocked.
What the game's own status effects screen says
In the game data this effect appears as DuelProducerMark, DuelTargetMark.
Champions that apply it
No champion with an indexed page applies this effect in the current game data. It may belong to a boss or an event, or to a champion the data does not cover yet.
The description is the game's own text. It has not been tested in battle here, and the game's wording can be loose (for example about numbers that differ between versions of an effect). See Data quality for what has and has not been checked. Found a mistake? Use "Report a problem" at the bottom of the page.