fktifzobr
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You really can't do without flying units, and if a phoenix is going to belong to a faction (not be neutral), it should definitely be a Light Elf unit (even though it's associated with fire rather than earth).
Actually, according to the description of the phoenix (I think it's from Heroes 6), the glow isn't fire at all, but light somehow connected to primordial magic and Asche – I don't remember the exact description, sorry:D
Added 2 hours 8 minutes ago
Skillwell will now be on the first page.
A phoenix can also exist at level 5; in Heroes 6, after defeating the Thunderbird, it lost some of its power and became smaller. The phoenix is a similar creature and can be of any strength and size.