Pepey_LePew
Crown's effect is good, but it is hard to properly limit the effect it and the 'fake' crowns will have. If an Adept could normally cast two novice spells at once, the fake crown would let him cast two apprentice spells instead. The normal crown rictus has would let an Adept cast two Adept spells at once. Since Rictus is a Master and even better than ordinary ones, he should be capable of casting a Master spell in Destruction (that would take more effort, like Blizzard) and still keep one or two familiar spells like telekinesis and rock wall going.
Good effect but you could have done something with the standing stones and signs. For example the stones activate in the presence of the crown and a mental command to accept the sign. Say he used it on the Mage stone in game you get more experience using magic skills but in the story his comprehension of spells is better. He has to learn non alteration magic like everyone else this would make the process easier and it could still do as you have it