Please urgently look at the autoresolve problem in this thread: http://forums.elementalgame.com/432819
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Elemental Forums
https://forums.elementalgame.com/432819
Currently it appears that the enemy is not using magic either when fighting the player (or AI) using auto-resolve. The mana restriction should be ONLY on the player doing autoresolve, not the enemies (especially since the enemies in most cases don't use mana).