Floor Spikes

Floor Spikes
Skill: alteration/metal 18
Backlash: 17
Difficulty: 13
Effect Value: 22
Bonus Number to: Effect
Range: 4 (6 meters)
Duration: 32 (1 month)
Cast Time: 21 (4 hours)
Manipulation: range, duration, state
This ward requires the mage to have a large quantity of nails. He buries the nails in the area to be protected (a square area six meters to a side), points facing up. The spell detects folk with a divination magic skill of 13. If anyone tries to cross within the protected area, large metal spikes will erupt from the ground, impaling anyone in the area. The damage done is equal to the Effect Value. The spikes will remain out of the ground after the spell is released, unless the ward is disbelieved with a Mind or willpower total of 15.