Regeneration

Some items and spells grant bonuses or penalties to "Mana Regeneration" or "Stamina Regeneration". The game's documentation does not make the magnitude of these effects clear.

Mana Regeneration ticks every 2 seconds, so a "Mana Regeneration +1" item will give you 0.5 mana/second, or 30 mana in a 60 second fight.

A naked mage regenerates 1.5 mana / 2 seconds, regardless of stats.

The Bard talent "Song of Glory" regenerates approximately 0.6 mana / 2 seconds with 25 cunning and 1.4 mana / 2 seconds with 125 cunning. More measurement is required to determine the exact formula.