Getting a kill in this game will grant you a random effect with 40 to choose from. This can be effects such as:
Extra Damage
Higher sense
Create a big projectile that damages anyone it touches
Launch everyone up in the air
Instanly Gain your Ultimate
Teleport everyone to you
Get slept for a Random amount of time
And more
The Effects last for 5s and can be changed and upped in the workshop settings. Getting a kill will reset that timer.
