In my opinion, the factions should be designed in a way that allows the player to decide how they want to play. If they want to focus on defense, they can. If they want to play offensively, they can. Although, looking at the current Haven, it's clear that its main feature will be strong defense, while demons will have good stamina, and necromancers will have speed. Will there be any initiative in the game, or not?
The game will bring back the turn-based system, as in Heroes of Might and Magic III, but the turn order will be determined by initiative, not the speed of the creatures.
Bow down and hear our cry,
Our earthly rulers falter,
Our people drift and die,
The walls of gold entomb us,
The swords of scorn divide,
Take not thy thunder from us,
Take away our pride.
G.K. Chesterton: English Hymnal