Energy is the Assassin's equivalent of the caster's Mana and the warrior's Rage bar. A certain amount of Energy is required by most Assassin abilities to be used.
By default the Energy bar is full, with 100 points of Energy.
Restores 10 Energy, removes all movement impairing Debuffs, and applies Vigor to you for 1 second. Using an attack skill breaks Vigor
Vigor: You are invisible, immune to all forms of Crowd Control and damage. Movement Speed is increased by 25%.
Rejuvination Potion
Heals target ally for 1.7367(Power ratio) and restores 150 Mana (95% reduced effectiveness for Energy and Rage) and applies Rejuvination Potion for 3 seconds. Can be used while moving.
Rejuvination Potion: Heals for 0.19008(Power ratio) every second, and restores 50 Mana (95% reduced effectiveness for Energy and Rage) every second.