Discussion about the Sanctuary faction.

I only play as Haven. I use a mage hero on the path of blood. First, I acquire abilities that affect initiative, morale, luck, and automatically triggered army buffs, and only then do I move on to the magic section. As a rule, I take lightning, mass healing (which initially comes as a hero's specialty), both types of regeneration (for which it would be good to develop earth magic a little), and I definitely max out the power of air and water magic, as the hero has monsoon and water grave or water tomb among his individual spells... Then I take primal explosion and time stop (or something like that), sometimes I take slow and dispel magic. If desired, you can develop the power of primal magic. Sometimes I choose ice storm and eternal winter from water magic, but I always take water elemental summoning. As well as light elementals.
In general, that's how I do it. I haven't figured out all the skills yet, so the list is probably not very good.