Crystal Barrier

Crystal Barrier is a purely defensive spell.

Spell Description
Casting this spell causes several large crystals to rapidly grow from the ground, blocking the path of possible foes. However, these crystals are very unstable and dissolve after some time. So the mage has to use the won time wisely in order to make the best of this spell. Note that it is not possible to let crystals grow on the ground where a foe is standing.