[Dimmie Dunce]

Spell Slips sometimes do not refund certain spells even when selected. IE: Prismatic Pillars or Earth Spikes if selected will not refund the 10 RPP but still use the potion.

Spell Slips also have a penchant of not offering all intermediates for refund, at least in Crystal. I tried to use a spell slip to remove Crystal Cocoon but it only allowed me to remove Prismatic Pillars.

Edit: Conjurer Stance also did not refund for me.