Thanks for that info rdonj and the info on the spell used by the final sacrifice mod. May be useful to use (I like the holy variant of the modified spell), and while it works for underwater units, a more appropriate message/description for underwater destruction might be better than flames from the sky.
Wonder which aquatic only freespawn R'lyeh gets. I have been considering modding their aquatic only units (slaves, crab hybrids) to be amphibious. Shouldn't be too difficult. Wonder if that would make R'lyeh ultra powerful.
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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).