If a corruption spell is cast on a node that is being built on in a city sphere, the node will visually change to death but it will still count as whatever node it was before. Sometimes I have even had a node just die and it is not built and it can no longer be built on. Often times the build button will look like it can be activated, but it doesn't do anything. Corruption can mess up a node if it is being built on and if it is already built. In general, this is a buggy spell.
