I think some of the confusion in this thread is caused by this sentence: On your turn, you must engage the target you challenged or challenge a different target.
What I think this sentence means is this:
Each turn, you must engage the target you challenged or challenge a different target.
With this rewording, it becomes apparent that in fact the mark does have a Sustain: entry - to sustain it, you must continue to engage the target (by attacking it or ending your turn adjacent). Once you fail to do either of those, the mark drops.
Also, this means that each time you engage the target, the mark is being re-established, without needing an extra minor action to do it.
So, the extra damage question: the damage dealing ability of the mark is restored each time you maintain the mark. Each time you sustain the mark, the monster can take damage - but only once each time the power is sustained.
What I think this sentence means is this:
Each turn, you must engage the target you challenged or challenge a different target.
With this rewording, it becomes apparent that in fact the mark does have a Sustain: entry - to sustain it, you must continue to engage the target (by attacking it or ending your turn adjacent). Once you fail to do either of those, the mark drops.
Also, this means that each time you engage the target, the mark is being re-established, without needing an extra minor action to do it.
So, the extra damage question: the damage dealing ability of the mark is restored each time you maintain the mark. Each time you sustain the mark, the monster can take damage - but only once each time the power is sustained.
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