Saeviomagy
Adventurer
Also the word "interrupt" in the power doesn't mean that the dragon's breath is stopped by your use of it.
It just means that you do your thing before the dragon does his.
So - assuming you move next to the dragon and mark it:
The dragon breathes
IF the dragon's breath doesn't include you as a target, you get to use warden's fury. You make an attack roll, hit or miss, roll a damage roll as appropriate etc.
THEN (unless you killed the dragon)
The dragon still breathes, and his attack rolls with the breath take a -2 penalty IF he didn't include you as a target.
Oh, and it has no problems turning to smack you upside the head.
It just means that you do your thing before the dragon does his.
So - assuming you move next to the dragon and mark it:
The dragon breathes
IF the dragon's breath doesn't include you as a target, you get to use warden's fury. You make an attack roll, hit or miss, roll a damage roll as appropriate etc.
THEN (unless you killed the dragon)
The dragon still breathes, and his attack rolls with the breath take a -2 penalty IF he didn't include you as a target.
Oh, and it has no problems turning to smack you upside the head.