Discussions about battles on Ubi.com.

There is no universal tactic for Ossira; you have to adapt to your opponent.
If I were to describe a tactic for every opponent, the message would be too long. So, here are a few general tips:
1) Against mages – rush. You can't hide archers from their spells. Position your units on the battlefield so that your Unique units, Dancers, and Dryads can reach the enemy as quickly as possible. Use archers to attack the most dangerous units. If Ents can't reach the enemy on their own, teleport them.
2) Against melee units – protect your archers and druids with Ents, Unique units, Dryads, and Dancers. Use a strictly defensive tactic. Cast either Haste or Slay on your archers first. Eliminate anything that can harm your archers (griffins, archers, casters, ballistae). Then, let your archers do their job.
Problems with griffins and their dive attacks can be solved by either retreating or teleporting.

The main offensive force is Archers and Unique units, followed by Druids.
Ents, Dancers, and Dryads – depending on the situation.

I never split up my Unique units. You can split up the Druids into 29+1 (Stone Skin on Unique units or Ents), or split up the Archers into 40+40. Against the Undead, use 45+45 Dryads (they dispel spells and do other useful things).

So, first, decide on a hero and then duel, duel, duel!
Everything comes with experience);)