Hybrid Paladin Feature Divine Challenge (Hybrid)

You boldly confront a nearby enemy, searing it with divine light if it ignores your challenge.

At-Will        Divine, Radiant
Minor Action      Close burst 5

Target: One creature in the burst

Effect: You mark the target. The target remains marked until you use this power against another target, or if you fail to engage the target (see below). A creature can be subject to only one mark at a time. A new mark supersedes a mark that was already in place.
While the target is marked, it takes a -2 penalty to attack rolls for any attack that doesn’t include you as a target. The first time it makes an attack that doesn’t include you as a target before the start of your next turn, you can use an immediate reaction to deal radiant damage to the target equal to your Charisma modifier. The damage increases to 2 + your Charisma modifier at 11th level and 4 + your Charisma modifier at 21st level.
On your turn, you must engage the target you challenged or challenge a different target. To engage the target, you must either attack it or end your turn adjacent to it. If none of these events occur by the end of your turn, the marked condition ends and you can’t use divine challenge on your next turn.
You can use divine challenge once per turn.

Special: Even though this ability is called a challenge, it doesn’t rely on the intelligence or language ability of the target. It’s a magical compulsion that affects the creature’s behavior, regardless of the creature’s nature. You can’t place a divine challenge on a creature that is already affected by your or another character’s divine challenge.

Published in Player's Handbook 3, page(s) 146.