alteritem Count, Type [, new Count] [, new Type]

Transforms a collected item on an on:use-event into another item. Count defines how many items are required for the transformation. This count will (in case there are enough) transformed to the new count (default 1) and type.
If you enter a value for new type you can also use the function outside on:use. In this case the item of type Type (and not the selected one) will be transformed to the item of type new Type