Energy is a resource used to fuel the basic abilities of a few champions in place of 
mana. It is represented by a yellow bar instead of blue.
Since energy regenerates much faster than mana, energy champions are not at the risk of depleting their resource over time. However, due to the maximum amount of energy being capped at a low amount with no growth per level, their ability combos can deplete energy in an important situation and leave them unable to cast spells for a few crucial seconds while their energy regenerates (unlike mana champions, whose mana pools increase, nullifying this problem as the game goes on). To aid this, they all have abilities that can refund a small amount of energy under particular conditions, if the actions are executed properly. Additionally, the energy costs for many abilities decrease as they are levelled up, and the energy champions' ultimate abilities do not cost energy to cast.
Unlike mana, the maximum energy of a champion cannot be increased. Energy restoration can only be increased by the 
Crest of Insight.
General
- The base maximum for energy is set to 200, with the exception of
Shen with 400 base energy.
Champions
The following champions use energy:
Restoring energy
General
- The base energy regeneration is 10 energy regenerated every second (50 per 5s), effectively requiring 20 seconds to regenerate the entire 200 energy pool. Shen will require twice as much time to restore his entire energy pool, increasing this time to 40 seconds.
- Returning to the spawning pool, which restores a percentage of your maximum energy per second.
Champion abilities
- Akali's Assassin's Mark and Twilight Shroud
- Kennen's Mark of the Storm and Lightning Rush
- Lee Sin's Flurry
- Shen's Shadow Dash
- Zed's Living Shadow
Buffs
Trivia
- All ninjas in the game use energy. Lee Sin is the only non-ninja champion to use energy.
- In Dominion, the base energy regeneration is set to 12 per second (60 per 5s).
- From patch V1.0.0.150 to patch V4.20, the Ichor of Illumination granted increased energy regeneration.
| Offensive |  Ability power ·  Attack damage ·  Attack speed ·  Critical strike chance ·  Critical strike damage ·  Armor penetration ·  Magic penetration ·  Life steal ·  Omnivamp · Physical vamp ·  True damage
|
|---|---|
| Defensive |  Heal and shield power ·  Health ·  Health regeneration ·  Armor ·  Magic resistance ·  Tenacity ·  Slow resist
|
| Utility |  Ability haste ·  Energy ·  Energy regeneration ·  Mana ·  Mana regeneration  Movement speed ·  Range
|
| Other |  Experience ·  Gold generation
|