Isaac of Holland's Alchemy Summoner

The magic in the piece was developed by one Isaac of Holland.  He was an alchemist in the 15th Century, about whom little is known.  He most likely preferred it that way.  However, do not allow the fact that little is known about him in history books diminish the fact that he was a very powerful sorcerer who was well-versed in many different kinds of alchemy.  You just have to do your research in order to find his magic.  He has written under many different pen names and pseudonyms specifically because he didn't want people to find out who he really was.  For those he trusted most, he developed a tiny mystery school, which wasn't much of a school at all.  Rather, it was just a covert dwelling he built in the woods, where he would teach his pupils how to use the magic that he had developed.   One of the things that he would teach his students in this secret confines was the ability to summon angels and demons in the true form.  In doing so, he was able also to siphon the powers of thes