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On large maps with long development times, I do the following:
1) I take Axel (and Ellaine, as soon as she appears in the tavern).
2) I build Peasants, Archers, and Griffins.
3) After buying these on Monday, I clear out everything I haven't already taken.
4) I build Monks, Cavalry, Angels, as well as all economic buildings and training halls.
5) I try to convert all the Monks into Paladins (if you buy all the Peasants with Ellaine in time, this is possible).
6) I don't build Swordsmen – there aren't enough resources, and they aren't needed. I don't buy Griffins – I don't want to waste money.
For the final battle, we'll need a hundred to a hundred and fifty Paladins, all the accumulated Archangels (usually around 20, maybe fewer), and an Expert Light creature with mass spells... That's it! Everything else is minor.
If we're playing against the Dark faction, we need Anti-Magic. There are usually enough resources; the main thing is not to take on too much and not waste resources on unnecessary wars. To do this, you need to get Leadership with Speed Aura and Enthusiasm as early as possible; Tactics and Retribution in attack. With Tactics and Speed Aura, you can reach any location from anywhere in one turn – archers are no longer a threat. Losses are minimal. In the main battle, the number of turns the Paladins take equals the number of enemy units destroyed. The hero casts Haste and other spells if available, and the Angels resurrect the Paladins. It's best not to prolong the battle.