Haven faction discussion.

Based on initial impressions, a defensively positioned alliance is difficult to break through. The Guardians provide additional armor and an extra attack on counter-attack, the Sisters heal damaged units, the Glorias attack enemies from a distance and blind them, taking them out of action, and the Griffons thin out the enemy with an aerial strike and then relentlessly attack with counter-attacks – combined with the Guardians' ability....
With a bit of luck regarding the terrain, the "Guardian Angel" can completely shut down this human fortress for an entire round.
+ there are also Riders and Seraphs.

It's somewhat reminiscent of Heroes of Might and Magic V, but there are even more advantages here.