Spike Field

You create a 20x20ft field of spikes. Any creature moving more than 5ft per movement action across it takes full pierce damage equal to your Focus for each 5ft they move across the field.

If the movement through it was forced movement, you only take the damage once.

Lasts until the start of your next turn.

Upkeep: 1 mana, extends the duration of the spike field by 1 turn.