Yea, I think it's an issue that necrofire lasts for the whole combat, no matter the time. Furthermore is can overwrite everything and cannot be removed at all (except for Bless which sucks, since 1 turn later everything burns again).
Can cursed ice be overwritten by fire? That never came up in my game sessions. Poison and oil are the most common thing I tend to use, and well these burn really good.
