You're in your Umbral Ice form and about to hit Thunder 1, because that's the one you use to reapply the DoT since it's low MP and a quick cast time.
SUDDENLY
You get a Thundercloud proc on the last few seconds of the DoT already on the boss. It's already happening AS YOU'RE QUEUING UP Thunder 1.
So what happens? Does it apply a Thunder 3 level DoT as well as the really strong Thunder 3 damage? Even if you hit Thunder 1 (or Thunder 2 for whatever reason) it should apply the Thunder 3 damage, right?
Wrong. You just applied some wimpy Thunder 1 base damage and DoT. Pure RNG messed you up simply for queuing an ability beforehand.
ALL THUNDERCLOUDS should apply Thunder 3 damage, since there is no reason you'd ever want to waste a free, instant cast on a weaker version of Thunder. I shouldn't be punished because of insanely bad timing as I'm pushing a button that is a core part of my rotation.
Please. I look forward to it.