In addition, there is the consideration that things within the game itself may remove the ability of PCs to generate particular effects, either temporarily or "permanently", including (but not limited to):
- Sunder
- Rust Monsters
- Disenchanters
- Spellthieves
- Confusion effects
- Level Draining effects
- Stat Draining effects
- Wish/Alter Reality effects
- Expenditure of charges