Wall of Thorns
From Ars Magica
Every wall has its thorn...
Creates a wall of cactus blocks from the block targeted and extending out in the direction the caster is facing. The higher the casting mode, the longer the wall. These blocks will disappear after a short time, and destroying them will not make them drop cactus.
1 x Plant Essence when cast augmented.
Castable by Caster Block