I think the damage of all spells should be x + y per shard, because otherwise the spells are useless at the lower levels and overpowered at the higher levels.

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I agree that spells need an overhaul.

Be careful, every time I've mentioned D&D-like changes to the game, people get bent out of shape here.

My solution would be to make spell damage a function of the sovereign's level, with the shards acting as modifers/amplifiers.

In that case you would have useless spells at the beginning and overpowered spells at the end, because the hit points do not scale as much as the spell damage IF you add multipliers like warlock, evoker and items:

Soulspark at level 1: 3 points of damage (2 + 1)

Soulspark at level 20 with warlock and evoker IV: 50 points of damage (2 + 20 + 50 % + 80 %)

We need some cheap spells, maybe even free spells, that do not scale much, so they are good at the start and not overpowered at the end.

As an example - the lighting that goes through up to 5 units in a line - it is always set at 10 damage. If it cost 10 or less mana, it might be an interesting early game option. As is, it is pretty useless.

So, some suggestions:

0 mana, 4 lighting damage. Maybe even +1 damage per level? Could be a level 1 air spell. "Arc"

5 mana, 2 poison damage per round to a single unit. Level one death spell. "Fester"

5 Mana, melee attack damage (but at range). Level 2 earth spell. "Displaced Blade"

0 mana, 2 cold damage, 50% chance to daze. Level 2 water spell "Chill"

10 mana 3x3 area of ground ignites, doing 1 damage to anyone in the area, and 1 damage to any unit that moves onto the burning area. Level 2 Fire spell. "Burning Ground"

Yeah, i think the Aeromancy, Geomancy, Hydromancy and Pyromancy spells should be in the spellbooks and not in the Mage tree, because they are useful for all paths.

Aeromancy (+ 25 % damage with Air spells) > Summon Air Elemental

Geomancy (+ 25 % damage with Earth spells) > Summon Earth Elemental

Hydromancy (+ 25 % damage with Water spells) > Summon Ice Elemental

Pyromancy (+ 25 % damage with Fire spells) > Summon Fire Elemental

Prodigy I (+ 15) > Evoker I (+ 25 %) > Affinity > Savant > Prodigy II (+ 15) > Evoker II (+ 25 %)