How do you kill a summoned phoenix?

Your advice seems a bit odd. After all, the question of how to kill a phoenix with a Necromancer is usually not relevant, and the answer is obvious. Much more often, the question arises of how to kill a Necromancer's phoenix, especially with a Knight (which is what the author of the topic asked). And here there are 2 options: either kill the phoenix with brute force (remove its retaliation, shoot it, etc.), or eliminate the rest of the army so that it disappears on its own. Other factions have significantly fewer problems with the phoenix.