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It all depends on what kind of Phoenix it is.
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Haven has an entire army; you can cast a lot of weakening magic on him to reduce his defense:D, and by that time, you'll have a lot of them. But if you use other factions:
The Elves' archers will tear him to shreds!
The Necropolis has Death Knights and Banshees.
Inferno can kill him with archers and cast a lot of nasty magic on him:)
The Fortress can use powerful runes.
The Castle has poison archers, a lot of nasty magic, and dragons.
The Stronghold, of course, has archers:D, and you can unleash Cyclops with Fury on them (free ones are best:)).
In a duel, the best thing to use against him is a Necromancer with his Death Knights: I think everyone remembers the special skill that removes at least one creature; it works great on him!
P.S. The answer turned out to be almost uniform because it's clear to everyone:)
I don't quite understand why all the races except Haven are mentioned here, since the topic is about Haven...
But if that's the case, then Inferno has Lords with that ability... One hit - one corpse...
And for Haven, only Archers or Paladins have it...
Everyone here was discussing how to defeat a phoenix using summoning or chaos magic. However, it's unlikely that a Knight needs these skills. The most optimal option is...to upgrade the Ballista! And it will tear the phoenix to shreds, even if it has more than 1000 HP.
Level up the "Expert in War Machines" skill, then the Ballista, then the "Triple Shot" skill for the Ballista.
You can also level up the attack skill, take "Archery," and then "Greek Fire."
In the end, you get a VERY powerful Ballista.
And for an even more devastating effect, you can use the hero Vittorio.



If that's the case, then I think that around level 20, a hero can defeat a single creature of level 7. I think this will work on a Phoenix as well. (it should, in principle).