How to understand and use the Energy Regen attribute
Introduction – Why Energy Matters So Much
Energy is the heartbeat of every immortal. It’s what fuels their ultimate abilities – the big, flashy, game-defining moves that usually decide who wins the fight. Without energy, your immortals are basically swinging wet noodles – with a few exceptions.
Each immortal automatically gains energy over time, plus extra from certain buffs or abilities. Once they hit 1000 energy, they cast their ultimate.
A lot of players underestimate how much energy regen speed defines an immortal’s tempo. Whether your team cycles ultimates fast and keeps pressure up, or fires off slow, heavy-hitting bursts depends almost entirely on this stat.
How Energy Regeneration Works
All immortals regenerate energy passively every second. You can see their specific regen speed in their info window:
Open your immortal → tap Power Info → look to the bottom → for “Energy Regen”.
That number shows how much energy per second your immortal naturally gains.
For example:
- Hippolyta: 142 energy per second → ~7 seconds to reach 1000 energy.
- Genghis Khan: 83.1 energy per second → ~12 seconds to reach 1000 energy.
So Hippo can cast almost twice as often as Khan without any buffs. But that doesn’t mean Hippo is stronger — just that she plays faster. Khan hits harder but slower, meaning any regen buff has a bigger relative effect on him.
Why Regen Speed Changes Everything
The faster an immortal regens energy, the more ultimates they can cast in a fight. But the important nuance is how that interacts with other effects:
- Flat energy gain (like Adrenaline Rush or Energy Burst) adds fixed energy each trigger.
- Percentage-based buffs (like Blessing of Rage or Matilda’s ultimate) multiply your base regen rate.
So, if you’ve got a low-regen immortal like Khan, flat energy skills are more impactful. If you’re running someone with naturally high regen, percent buffs scale harder. Note that there are also other factors to consider, with Adrenaline Rush you need attack speed whereas Energy Burst needs many damage instances and high critical hit rates. However the principle remain.
Here’s an example:
- Hippolyta gains 142 per second.
Add Blessing of Rage (20% bonus): +28 energy per second. - Khan gains 83.1 per second.
Same Blessing: +16.6 per second.
Both benefit, but Hippo gains nearly double the extra energy — that’s why Matilda and Blessing of Rage feel insane on immortals who already regen quickly. That being said, this does not mean you should never run e.g. Blessing of Rage in lightning Khan builds, the gain is still hugely valueable, but you need to understand what it actually does and how it impacts your immortals.
Examples & Synergy in Action
Here’s where this gets fun. Energy regen isn’t just about speed — it’s about timing synergy.
Take Theodora + Yi Sun-sin (YSS) as an example:
- Theodora regen: 93.7/s
- YSS regen: 97.6/s
That means both hit their first ultimates around the same time — YSS at about 10.24 seconds, Theo at 10.67 seconds.
When timed right, YSS’s artifact buff (which increases healing by 30%) is active when Theo’s heal goes off. That’s free extra sustain purely from energy syncing.
Exceptions & Special Cases
A few immortals ignore or bend the energy system:
- Alexander and Hannibal: Once you unlock their unique artifacts, their ultimates become passive — energy doesn’t matter.
- Manco Capac: Only needs 1000 energy once; his ultimate stays active after that.
- Control effects (like stuns, silences, and water dragon strikes) can interrupt ultimates or remove energy regen for a time (silences). If you’re unlucky, your immortal might lose energy mid-cast and never fire off.
So even with perfect regen, battlefield chaos can still ruin your timing. Always account for those disruptions in real fights.
What Affects Energy Regen
Several things modify your regen stat directly:
- Technology:
- Energy Surge → +5% energy regen speed.
- Talent Trees:
- Owl Guardian (in the Military talent tree) → +5% energy regen speed.
- Immortal Boost Levels:
- Total +14% at Boost 30. (5% at level 9, 5% at 19, 2% at 24, 2% at 29), read more here.
- Artifacts (Surge Bonus Roll):
- Available for Attack and Support types.
- +5% base bonus, increasing with star level and quality.
- Max caps by season:
- S1 Bronze: 15% cap (5★)
- S2 Silver: 20% cap (5★)
- Conquest & Legendary (Gold): 25% cap (5★)
Stacking all these together can make a huge difference — especially for immortals who rely on frequent ultimates like Hippo, Merlin, or Himiko.
Conclusion – The Bottom Line
Energy regen isn’t just another stat — it’s the tempo of your march. It defines how often your immortals cast, how their combos line up, and how much value you get from skills and other boons.
Knowing how Energy Regen works will help you understand how to setup immortal synergies, skills and to understand combat performance as well as how to optimize your choice of setups and builds.
Published: 05-11-2025