The mark applied by a paladin's divine challenge is in addition to any marks on other creatures applied by the paladin's divine sanction. The penalty to a marked target is the same, whether marked by divine challenge or divine sanction, but divine challenge marks can be maintained indefinitely, as long as the paladin continues to engage the marked target. Essentials update 2 improved divine challenge. The update removed the restriction on using divine challenge on the turn after a paladin fails to engage the marked target or challenge a different target.