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Here’s another small idea that is unlikely to be feasible. Could we add a special ability that transforms one type of creature into another at the end of the day/week/month?
If so, why not create elemental mages who replace, for example, all gremlins with elementals or phoenixes (5 heroes, each with a unique type of elemental) in a ratio of 20/1 and 100/1.
And here’s a big idea (which is unlikely to be implemented). Give other races energy similar to Necromancy points (give mages elemental energy and add it to their racial skill).