Rage and mana gains decay as the battle wears on; you get a little message in the message box informing you. At round 10, gains drop to 50%; at round 15, to 25%; at round 20, to 0. However...
-Mana and rage gains from abilities and spells are generally not affected.
-You are guaranteed at least 1 mana from Transmute, even after round 19.
-I'm not sure of the mechanics, but I've noticed that if I just leave 2-3 enemy dryads alive after a fight, then kill the sprouts they summon immediately, it will consistently totally refill my rage, even well past round 20. This may apply to other summoning units as well?
I think that covers the key points. There are many infinite-mana loops based on those exceptions, all of which are painfully tedious... so in general I'd recommend adjusting your tactics to make using any of them unnecessary.
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