Honestly, in my case, all those terms are new to me and google has failed to explain Entrophymancy for me and Flesh Sculpting. xD
But seeing as you're talking about Necromancy, I can assume that Flesh Sculpting means to recreate flesh on a deceased corpse so it may live again.
The way Mordecais work, according to what I've read, is that they each have a certain and constant field of range, that varies from Mordecai to Mordecai, in which magic isn't allowed.
Let me explain:
When you're inside a field of the Mordecai, you cannot recreate the flesh on a corpse. But if you had already done it outside of the field, then what you have created will not be undone; you will simply not be able to use any other magic while you're in that specific range. If you have brought someone back from the dead prior to finding yourself inside the field, then that person will remain alive and living.
You see, Mordecais don't negate the result of magic -but the act of it.
Adhara on the other hand, is a sub-ability of a few Mordecais that are lucky, in which they can create a field of 'anti-magic' around an enchanted object or something similar. The range, again, varies from Mordecai to Mordecai. This ability is different in the sense that it can negate the result of magic.
For example:
Remember that guy you resurrected? If he's submitted into the Adhara's field of anti-magic, he'll become nothing but bones and collapse lifelessly to the ground -assuming that was his initial state of being. If those bones leave the field of Adhara though, their flesh will return and they will live again.
This is what I've been able to grasp for all my reading. xD If I made a mistake on something, please correct me but this is my way of recapping and slowly learning the stuff myself. I hope we answered your question. ;)
P.S. I joined yesterday, so I have no idea about the stone buildings...