Hey so don't know if this is note worthy or not but I've been playing about here again and discovered that if
you have the Font filled with blood then cast 'Guiding Bolt' on it. The blood turns to water, I reloaded the save to make sure it was that, that had caused it. Then tested if guiding bolt did this is in a far corner of the room and it didn't. So defendant something to do with the Font. It does nothing that I can see but it might lead to something???