Arcane Power Gem

A special crystal enchanted to enhance the power of spells. Whenever you cast a spell, you can choose to use this item to double one effect of the spell of your choice.

For example; double the number of dice used when rolling damage, number of targets, double the range, double the duration, etc.

The gem shatters upon use.

It is unknown where these stones come from. Mages  have spent centuries trying to unravel their mysterious origins.