Desdemona is an attempt to create some sort of demonic counterpart to the Great Beasts of the Weald ShamansJust as the Weald's shamans create a Great Beast by layer the lives of spirit animals upon each other for several generations, so is the Bastard trying to do something similar by guiding the demon Desdemona through so many mortal lives, letting the imprint of their lives layer on top of each other in the same way to create something... more. To what end it's hard to say and how long that will take to achieve we can't know. But the end result will be... interesting.
Desdemona is a being similar to the Bastard's fatherThe creation of the Bastard, as described in Paladin of Souls is a mighty demon fat with the lives of many men, who is selflessly granted a soul by a humble hermit. Sounds like Des is pretty close to that, doesn't it? All it would need is Penric to gift her, and they're close enough for that.
Umegat's head groom is the lover he said was executed.The man's older than he is, clearly his *present* lover, and missing his thumbs and tongue, which Umegat said had been removed. "A fine pair we make..."
Cazaril survived at the end of Curse of Chalion by natural means.The reason belly wounds kill in a medieval setting is infection. The lightning-bolt fire of the death demon leaving his tumor cauterized the wound - cauterization being a technology they haven't invented yet - preventing it from getting infected and letting him survive and recover.
- The purpose of the "tumor" seems to have been to provide Cazaril with a spot where he can safely stabbed. When the blade is removed, instead of a gush of blood there's just some clear liquid and a hint of blood. As nothing 'major' was hit inside of him, the usual infection risks are gone.