I purchased this recently as I was looking for a magic system or subsystem outside of the typical spell slot based magic in 5e.

At first I thought that a skill check based system wouldn't work for me. However, I quickly changed my mind thanks to the example incantations. I was also pleased to see that this is a spellcasting system for anyone, no feat or class requirements neccessary. Better yet, a system is provided to create your own incantations. I started generating a few incantantions for my home game right away. There are notes for how Dispel Magic and Counterspell affect these incantations.

For worldbuilding, this helped to build one or two shadowy magic-based organziations in the world. It also provided helpful NPCs to assist the party in dealing with them. I have always liked the idea of rogues performing some sort of magic and this system fits just right for me.

Great work and very useful at my table!