Spell effects going through wall in Etheron HIlls orb room.
I can confirm this as I was there defending the keep too (I’m even in the screenshot). We were getting hit with AoE’s through the wall which ended up destroying a few of the carts, and we had to stay away from that wall as well to avoid taking damage. The result was that this thinned the defense on that side of the room which led to the alter being destroyed. Although we were able to keep the orb (And defend the keep), we were disappointed when it reset up North and thus we ended up losing it anyway.
As for what we were getting hit by? Flamethrowers for sure, I think some melee people were swinging through the wall, was getting hit by AoE too but there were no red circles I could see to designate that there was supposed to be enemy AoE there.
We had the corridor shut down pretty tight, so I guess they resorted to trying to attack through the wall because they couldn’t get into the room.