Tricky Trap

Race ability (Sagittarius)
The Scout sets a trap in a selected area with a radius of 5 yards. No one else can see this trap.
The trap is set in 2 seconds. When triggered, it stuns enemies in range for 4 seconds, poisoning them and dealing XX damage every second for 8 seconds. Disappears afterwards.
Affected enemies have Vulnerability applied to them for 6 seconds. It increases incoming damage by 25%.
The trap exists for up to 30 seconds.