I'm assuming K'tanya cast a mage armor on herself, but even so her best AC would be 16.  Unless there is something I don't know of.<br/><br/>So, yeah 21 to AC is a definite hit, and so - Mercusio, to the rescue!<br/><br/>BTW, correct me on this: cure wounds adds your spellcasting ability modifier as additional hp heal, right? Which is proficiency bonus + relative ability modifier? If so, cure wounds can almost never go wrong with the healing result.