NEW：
The Three Expansive Arrows
Gain 3 Arrow to the Death.
Monsters can only move out toward the direction of the arrow.
Monsters will suffer 100% more damage until change move direction, this effect cannot stack.
Lost 450 money.
CHANGE：
Slow attack speed by 6 seconds. Increase damage dealt to 2 times.
On kill monster, turret will attack again 1 second later.