Mana

Mana represents the magic power of a hero. It appears in the UI as a blue bar at the bottom of the screen under the Health bar. The left number shows your current mana, while the right number shows your maximum mana. Mana is the resource used to cast most spells, if your current mana is lower than the amount needed to use an ability, you won't be able to use it.

A hero's maximum mana is 13 for each point of Intelligence. There are also items that increase total mana directly, such as Point Booster.

Mana Regeneration
Mana Regeneration is a stat that determines the amount of mana a hero regains each second. It is shown as a small number with a + sign at the right side of the mana bar.

The shown value of this number is rounded up, but the mana regeneration itself isn't. Added percentage-based mana regeneration doesn't always round up. For example: Nyx Assassin has at level 1 0.73 mana regen (0.01 + 0.04*18), shown in-game as +0.8. A Sage's Mask adds 0.365 mana regen (0.73*0.5). With one Mask, shown value will be +1.0, when the effective mana regen is 1.095. However, with 4 Masks, shown value will be +2.2, when the effective value is 2.19.

Heroes regain mana every second equal to their base mana regen rate (.01 for most heroes), plus .04 for each point of Intelligence multiplied by any percentage increases from items. You can also get a mana regeneration boost by activating a Regeneration Rune.

There seems to be a max amount of mana regeneration that is possible, being at 500 mana/s, but this is only achievable through an absurd amount of Bloodstone charges.

Base Mana Regeneration
Every hero has a base mana regeneration rate.

All Heroes have a base mana regen of 0.01 except for the following:


 * Techies: 0.02 mana/sec
 * Alchemist (under Chemical Rage): 3/7.5/12 mana/sec

Formula

Total mana regeneration = ( Base mana regeneration + 0.04*Intelligence ) * ( % mana regeneration ) + ( additional mana regeneration*)

* Additional mana regeneration includes : Auras like, ,

Mana Drain
Mana Drain is an effect that removes a Hero's mana. Certain types of mana drain will also deal damage proportional to the mana lost.

Sources of Mana Drain

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List of Items that Grant Mana
* Item provides mana boost exclusively via intelligence boost. ** Power Treads provides mana boost solely via intelligence boost when Intelligence is selected.

List of Items that Grant Mana Regeneration
* Item provides mana regeneration boost exclusively via intelligence boost. ** Power Treads provides mana regeneration boost solely via intelligence boost when Intelligence is selected. *** Item provides mana regeneration via an aura which does not stack with similar auras. **** Arcane Boots do not give true mana regeneration, but give bursts of mana on a cooldown, giving an average mana regeneration.