As of your research into the arcane you have learned to mix your magics together making your own spells in a sense.
You can select two spells spend an hour+30 minutes for every other spell, to study the spells giving you knowledge on said spells.
The amount of spells you can have mastery of equal to your spell modifier.
When you cast any spell you have mastered if you have to roll to hit you have advantage if it is a save however the creatures under the effect have disadvantage.
You can combine to or more spells you have master allowing you to take one effect from each spell to combine them so you can take fire shield and armor of Hadar giving you resistance to damage type of cold or fire and 2d8 temp hp and any creature that attacks you takes damage equal to the hp you rolled, the dice you roll increases by a d8 for each level above the level you used to cast it.
However the spell slot cost goes becomes the two added slots level so the previous example would be a 5th level spell. If the spell goes above 9th level you can use other peoples spell slots to cast alongside the 9th you are using so if you mix two 9th level spells making it 18th you can borrow another caster's 9th level slot to cast it however the other person loses their turn assisting you.
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