Spike Trap

Description
Trap that pushes out a large number of spears from underground.

Usage
Spike Traps take up a 2x2 space and remain hidden from attacking units until activated. Units walking over it will be damaged by the spikes. It attacks every 2 seconds dealing a moderate amount of damage. It is best used in positions where you would expect enemy units would stay in the same place for some time, for example in front of a defense tower or a wind cannon. Ranged units will often be killed by these traps due to their ability to linger after activation, and so after it has been activated presumably by the melee force of the attackers, ranged units will often walk into it on their way to attack the next target.