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Phoenixes look beautiful, and why didn't the developers create a copy of the Conflux with air, fire, earth as level 1, water, light, darkness as level 2, and phoenixes as level 3? Just add some improvements and a city, and that's it – faction number 6 for Heroes 6 is ready.
Added 1 minute ago.
And regarding the fact that phoenixes don't hit hard, that's true. In King's Bounty, a phoenix (especially an ancient one) was a real disaster if you didn't know any spells.
Added 2 minutes ago.
And make heroes immortal (an almost extinct and dying race).
Sign 8, inverted.