Enchanters Lair in
► Game Version: v4.5.1
► Difficulty: Cataclysm
You used to be able to teleport through the floor in the boss arena. Fatshark in all their wondrous incompetence actually managed to fix that, so instead we do a flat wall clip + a corner clip to get through. Flat wall clips are a less versatile way to get through walls compared to corner clipping and they have high degrees of inconsistency, so I've always strayed away from them unless absolutely necessary like in this case.
Interestingly this type of clip originates from V1 (unlike corner clipping) and is still possible in its final build.