Polypiling

Polypiling is the action of polymorphing a pile of objects in hopes of getting some useful objects as a result. The pile is often referred to as polyfodder. The polyfodder often consists of junk.

Polymorphing potions will always yeld potions, scrolls will polymorph into scrolls, etc. Unicorn horns are especially popular polyfodder because they may polymorph into other magical tools.

Polypiling has its drawbacks. Trying to polypile too many objects of a same class at once, such as many scrolls, will cause the items to merge and creates a golem. Thus it is best to limit the amount of similar objects in a single pile and distribute your polyfodder into separate piles in a line that can still be polymorphed with just one zap.

Polymorphing may also randomly cause a system shock that makes some objects vanish. This is more likely when there are many objects on the pile, so that is another reason not to make the piles too big. The system shock is less likely to happen in case the objects to be polymorphed are blessed.