Headcanon: the Triple Goddess is the real reason Merlin is bad at healing magic (has to actively try and try hard when everything else seems to be oh so natural). She won't let him. We all know if he had that capability, he'd be using it as liberally as he could. He would saved Arthur. Laws don't apply to him (Nimueh gave him the water so it was because of her powers the balance had to be restored; he didn't do that himself. If he was able I have no doubt no one would have died). The Triple Goddess can't have that though. It'd ruin the whole "Future King" part of Arthur's Destiny.












