You can buy your self a crystal that helps you to build your tower in the way you want.

But you have to descide that kind of crystal you want. Once you sold it, it is gone and you can buy a new one.

If you sold it accedently, you can may recover it (see FAQ).

Crystals level while you using them and raise their level. Currently it is unknown what effekt a higher level crystal has.

Hower ever, here is a list of crystals. The information on thoes are mostly observed.

This crystal jumps to a target and slows it. Its currently unclear if this is a AOE skill or single target.

Some crystal info here….

UNDER CONSTRUCTION