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odnopozov dmitriy, if the difficulty level is lower than the hero's, clear the entire map, upgrade Markel, build castles, gather a huge army, and defeat Godric. Knight units should be transformed into undead. Peasants should be the last to be converted. A Phoenix isn't even needed here. Godric has only 1 castle, while you have 2 castles + external dwellings + joining units. Therefore, your army will grow much faster than Godric's.
A Phoenix is needed to defeat Godric on the hero's turn in the first week.
In treasure rooms, pyramids, and utopias, the set of spells changes every 4 weeks. Therefore, you can always obtain any spells of level 4 or higher if they are not available in the castles. All you need is patience and a developed school of magic.