I found the rules a little unclear on this. If the stegadon is in combat may I still cast burning alignment or the other two spells?
yes. as its not magic, you can still use it in combat, also, you cant dispell any of the engines abilities.
Yes, it can cast it into combat. That is why EOTG is awesome. I always love when an opponent asks if they can dispell it.
I knew it couldn't be dispelled, I just thought since the priest was in combat you wouldn't be able to use it.