[rtyffg]

Atlantis have sieged and take Marverny capital (killing fountain of blood in process). Some turns later, Marvernian god appeared in home province (now taken by Atlantis) and routed local PD. Since then he was sitting there, sieging his own capital. At least this is what my scout told me.
Maybe remaining priests called him back?

About Atlantis - maybe crazy, but could he just made stalling, while his territories\underwater territories declared untouchable? Since all remaining active nations seem to be land-based.