Bring cursed potions of invisibility, raw mana in line with potions of blindness
Thrown potions of blindness have a chance to fail (around 50%), while thrown cursed potions of invisibility and raw mana always succeed (if the target can be blinded). Given how debilitating blindness is to monsters (disables spellcasting and allows backstabs) and how common these potions are, it would make sense for all three to have the same chance to fail.