Now that idea of you seems to me the nicest Sombre. A Thetis' Blessing which becomes something you must consider very well before doing both as an underwater nation than as a land nation, because it can make you attack the enemy easily but even be counterattacked on your own territory! And it seems very fitting the Dominions 3 "magic mood", as many spells of this game affect everybody, empowering the enemy too, or damaging you too, and as side effects that must be considered carefully. Nice nice nice idea imho!!
P.S. In effect, the actual Thetis' Blessing as well as a reverse version seem a little too cheap and easy to me. But a version that has both the effects is so strategically interesting I can't find words for it
