- Which faction is stronger? (Necropolis, Tower, or Conflux)

Conflux is definitely unmatched, unless there are some special circumstances on the map, such as legions of small monsters surrounding Necromancers or super artifacts. A hero with Phoenixes goes first, which allows them to cast spells first, and the Phoenix growth is overpowered. 2,000 skeletons will quickly disappear against a fast hero with Phoenixes, good magic power, and a 5th-level Earth magic spell in the late game. And there's no need to even talk about the early game – the firebirds allow you to defeat almost all neutral creatures without losses, and they are easy to build.