Well, I think NeOmega has a nice idea with a minor sea-animal summon for the OO. I would suggest (well anything that fits, wether a minor "sea squid" or something more sinister, or more shark-like, or even fish-men-things) ... something of weak-ish strength, perhaps 4 or 5 strength. Marskman ... since they are attacking from the depths or what not. Probably Ocean Stealth ... being that they can cast the Hide spell on water tiles ... of course they become visible after attacking, similar to Ghosts. Also, a certain degree of Collateral Damage. Perhaps not as much as a Catapult, although a significant amount, maybe 30% collateral damage or some such, at a maximum of 50% collateral (or up to 75 if we want the Collat Damage to be some-what equal to the Tsunami spell, which is of course understandable).
So basically its a hidden under-sea unit which can attack smaller, weaker ships, and will cause some collateral to other ships in the fleet in the process.
Does anyone else think this Idea has some Merit? I'll admit it has roots in my initial Ideas for Aiphon specific spells, however (especially if its a Lovecraftian creature) it could fit as an OO replacer, or additional spell, as well.
In fact, I think it might be a better deal if Cultists get this spell, and Speakers get Both Tsunami and Summon Kraken. (also if Krakens are invisible, with marksman and have the Mask Spell ... thatll be nice)
Anyone else share my thoughts? This will allow for the OO to be more sea-based and less coastal, in my opinion ... which is partially why I initially formulated the Idea for the Aiphons civ.