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Logistics – as quickly as possible.
Attack – also preferably at the beginning.
Ranged attack – when playing as a Castle, Tower, Stronghold, on small maps with a Conflux.
Then, for larger maps:
Earth magic – an Earth magic expert is, in my opinion, better than an expert in any other magic.
Wisdom – without it, leveling up any magic is useless.
The rest depends on the map.