Planar Protection buff removed early

[cat]

- (4 times) You lose 1 Magic Point due to your Wisp Form. (2022-06-30 06:06:10).
- You seep through the cracks in the door to arrive inside Saint Dominic's Cathedral. (2022-06-30 06:06:12).
- You feel soothing sense of harmony creep over you. You will be immune to planar damage while under the effects of the Planar Protection potion. (2022-06-30 06:06:28).
- You focus your thoughts, transforming flesh and blood into raw magical power. (2022-06-30 06:06:32).
- You lose 1 Magic Point due to your Wisp Form. (2022-06-30 06:06:36).
- You walk into the forest and find yourself enveloped in the sights and scents of another, more beautiful world. (2022-06-30 06:06:36).
- You lose 1 Magic Point due to your Wisp Form. (2022-06-30 06:06:43).
- You feel yourself solidify as your magical reserves give out and the effects of Wisp Form fade. (2022-06-30 06:06:43).
- Your body has returned to the ground. (2022-06-30 06:06:43).
- You feel the effects of Sorcerers Might fade. (2022-06-30 06:07:07).
- You feel the effects of Planar Protection fade. (2022-06-30 06:07:07).
- The holy light eats away at your soul. You take 5 points of holy damage! You fall to your knees. Unable to withstand the overwhelming sanctity of your surroundings, you pass out and never come to. You have died! (2022-06-30 06:07:07).

Some kind of interaction between SM / wisp form / planar protection? Then squish from planar damage.
clash.php?op=character&id=13020

[Poinf]

Were you moving through the hallowed ground in the top left of Ely? The planar damage there bypasses planar prot potions.

[cat]

Were you moving through the hallowed ground in the top left of Ely? The planar damage there bypasses planar prot potions.

This was indeed the answer, nice catch!