Huge and hardcore gameplay modification with many magic schools and spells, that offers experience of fights between large squads of masterful opponents with REALLY different magical and martial tactics.
These mana indicators appeared in 0.9.7.
Grey mana orbs are above player mana capacity, red - wasted part of mana, bright blue - current reservoirs.
Casting spells of long-casting magic and excessive spells of momentarily-casting requires mana orbs.