Void Beasts Dissapear

[Leblanc]

Im not sure if this is a bug or what, but it did make me a bit angry when it happened. I was playing as Rhlyeh on the Faerun map and I was attacking a province with maybe 15-20 starspawn, 15-20 lobo guards and little thrall guys, my starspawn preist prophet, a starspawn commander, and another starspean priest. In my front I had two elder things and some other void beast (a thing that should not be perhaps?) The indy defense was made up of a bunch of militia and heavy infantry with maybe 10 archers. On the first turn my void beasts are blessed, and, without arrows firing, my thing that should not be dies. Next turn, with out any arrow hitting it, my full health blessed elder thing dies, and the same thing happens to my second elder thing on turn three. I still took the province, but lost all of my arrow fodder and was wondering if anyone else had encountered this before? These were my only amphibious void beasts too... quite irritating.