Why is Alleria able to polymorph you through the pillar, yet the pillar stops her void explosion? Line of sight should work the same for both abilities.
To force you to interrupt it, it has the Ignore line of sight flag.
Well that’s a bummer. So if she’s surrounded by fire, and void circles, you’re supposed to run in to interrupt and take a massive sanity loss? That’s pretty crummy.
Sometimes the test of skill is choosing the least damaging of several bad alternatives. Especially in a setting dominated by RNG.