Ranger - "Higher Vampire" [5th Campaign, 5th Mission]

People, he keeps running away from me, how and where can I finally catch him???

You need to drive him into the last castle, but before that, you need to destroy all the dragon nests (the sooner, the better). Giving away the entire dwarf set for phoenixes is stupid, as it makes the game much easier (almost with minimal losses), and of course, your hero should have leadership with empathy.