You searched for armor roulette
1. armor roulette
Syntax: cast 'armor roulette' <armor>
This legendary Illusionist spell adds armor class to a piece of armor that
is at least level 150 or higher. The amount added can be from ‑3 to 4 (not
including 0). The higher the caster's luck, the less chance of getting a
negative number. This spell can be cast safely upon an item 3 times before
the item's properties are altered so greatly that it has a chance to simply
explode on subsequent attempts. The more subsequent attempts there are, the
higher the chance will be that the object explodes. As the Illusionist
masters this spell, that chance will slowly decrease.