Metal Spider Temple
Here is a list of the curses inflicted as you explore. I wasn't exploring one tile at a time, so there is some error
~15 Tiles: Poison
~24 Tiles: Mana Burn
~39 Tiles: Corrosion
~44 Tiles: Corrosion
~49 Tiles: Corrosion
~55 Tiles: Weakening + Corrosion
~59 Tiles: Weakening + Corrosion
~64 Tiles: Weakening + Corrosion
~69 Tiles: Weakening + Corrosion + Warning of impending doom
~72 Tiles: Death
After further experimenting, it looks like poison and mana burn get reapplied at some, possibly all, of the trigger points.
It is just barely possible to get the Fortitude Potion, Burn Salve, and Whupaz, allowing you to get the Whupaz with no permanent damage. If you can use the ENDISWAL glyph, then you can also get the healing potion. If you worship Jehora Jeheyu, then venturing into the spider temple just prior to purchasing chaos avatar is another way to get out unharmed.
LEMMISI and BLUDTUPOWA attract The Spider's attention just like normal exploration.