Magic Crystal

Magic crystal is a special item used to reduce the mana penalty of using spells far from the stockpile.

Use
It can be placed anywhere over a support block. And can be extracted without destroying it. It occupies a space of only one block.

But you have to place it near the location you want to use your spell.

Acquiring
The magic crystal is not craftable. The only way of acquiring it is paying 25 coins at the shop.