Rank 1 Increases the damage of your Serpent Sting ability by 6%, reduces the cooldown of your Viper Sting ability by 2 sec, and increases the duration of your Scorpid Sting ability by 15 sec.
Rank 2 Increases the damage of your Serpent Sting ability by 13%, reduces the cooldown of your Viper Sting ability by 4 sec, and increases the duration of your Scorpid Sting ability by 30 sec.
Rank 3 Increases the damage of your Serpent Sting ability by 20%, reduces the cooldown of your Viper Sting ability by 6 sec, and increases the duration of your Scorpid Sting ability by 45 sec.