Allurr
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A quite logical (and atmospheric) buff to offensive water magic would be to add a slow effect to Ice Bolt and Ring of Frost (for example, for 1 round with advanced water and for 2 rounds with expert). However, simply adding a slow effect for a number of rounds equal to SP wouldn't look imba either. But rather a normal buff. In many games, when you shoot cold, it slows down enemies along with dealing damage.
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There is also a somewhat crazy idea for a set artifact (perhaps it has already been mentioned).
Sword of the Slayer/Infernal Blade
Type: Weapon (set)
Price: 25000
Assembled from:
Sword of Hellfire
Shield of the Damned
Breastplate of Brimstone
Hellstorm Helmet
+6 attack, +6 defense, +5 spell power and +5 knowledge.
At the start of battle, it casts an expert-level Slayer spell on all friendly squads for SP (or classic 50) rounds.
Optionally, some -X to opponent's luck could be added to the set bonuses, since the Inferno theme is evident :)
It will become a bit easier to take Dragon Utopia :) or cut out the opponent's level 7 stacks in the finale and corresponding level 7 stacks of ГО. On Clash, this set might potentially show some interesting colors)