The most powerful warrior.

Phoenixes are only relevant at the beginning of the game, but after 3-4 months, Twilight Dragons rule!

Twilight or Black Dragons? After 3-4 months, it's probably the Black Dragons. It's a shame the question was asked so specifically; the most powerful unit is, of course, the Lava Dragon. However, with the release of the second expansion, when I hope the bonuses of Axel will also be given to the Knights of Isabel, they will be a very formidable force after 3-4 months, with a speed aura on top of that. They will be able to completely or almost completely destroy two enemy units at the beginning of the battle, and with the support of Archangels... just let Haven develop:D