Hey, if we want to allow a single rainbow pretender into the game on behalf of the merc. I've no problem with it. If he wants it! The dagon is pretty cool, ehh, I suspect an Ancient Kraken with an amulet of the fish wouldn't be bad either.
While many water "spells" are not be that useful here (I'm guess the ones that can only be cast underwater), there are probably a decent number of water items that very useful, Frost Brands, Ice swords, can't remember em all. I hate the usurpers ability to compromise the water dominance of the merc and vice versa, but that is an exception I made. Which makes me quite upset.
Don't beleive there's an existing site that qualifies with a single gem in every path but with a good amount of water, but let me look and see what is available.
Don't want to add any more mods my friend.
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IMPERATOR·CAESAR·LVCIVS·SEPTIMIVS·SEVERVS·PERTINAX·AVGVSTVS·PIVS
Be harmonious, enrich the soldiers, and scorn all other men.
-Emperor Septimius Severus, to his sons shortly before his death, quoted in Dio Cassius (77.15.2).