"winning" is not stomping.
Donkatsu has cleared Insane with other classes, including Anorithil, a Rank C on this chart.
I was never in a situation where I couldn't cut off all threats with Ice Wall in exactly the same way you would with Stone Wall.
Edit: In theory, such a situation could exist, but not with any of the dungeon layouts that are currently in the game.
I think this it's more accurate to say "Such a case can't exist if you stay consistently aware of your surroundings and, optimally, have a good feel for how the roomer produces areas.". I wanted it to come out extremely powerful if you knew how to use it, which required good situational awareness and hopefully wasn't boring as hell.
If you play optimally, Ice Wall is an extremely powerful tool. That was the idea. I wanted it to come out being a form of constant area manipulation. Wyrmic has other tools that play to this theme but, sadly, Quake is a little too unreliable to make a powerful area control talent, and Burrow/Lightning Speed are an aid to that game, they don't produce it alone.
If it helps, I've tossed the idea around of making it "long but not indefinite" when I get some more stable and generalized extra tools on Wyrmic. For now, though, it takes some convincing that it's, say, out of place good.
Of course if it's just
boring to win Insane with one as it stands, I'm all for nerfing the duration or CD reduction, that was the main thing I was worried about with that talent to be honest.
Edit: General consensus in #tome seems to be "just pull the damage, maybe add an iceblock chance damage type to it so it still freezes adjacent enemies sometimes", which would work fine for me, on the record.