Let monsters walk through water planes. Water planes. Let them walk through them. Tell them they can do it, in their terrible hindbrain monster AI that has them getting stuck trying to move around corners or over objects more than an inch high. It's water. WATER! It's a foot deep and has no collision, and they're freaking…
It's not that Mad Dragon is unforgivable (although frankly anything wherein you can be arbitrarily stunned while multiple knockup AoEs blossom under your feet ticks me off on reflex,) but it is very much out of sequence. The next three dungeons are a breeze by comparison, I practically sleepwalked through Idris but still…