Spells that are esoteric, wizards that are deranged and corrupted by magic, and mysterious magical symbolism are all features of some of my most enjoyed fantasy in roleplaying games. For this reason, I have been working on a solo RPG that, by the end, will have the player in possession of a grimoire of spells and a brief history of the wizard that created them. I think this could have great results when porting the grimoires into other fantasy games, however I have yet to finish designing the game. In the meantime, I wanted to show off the spell creation process as it currently stands. WARNING: Some of the spell offerings here depict violent or aggressive acts.
The above image demonstrates the type of spells that can be created using my process. The spells are referred to as Opus Phenomena Vicissitude because I thought it sounded neat and mystical. Each Opus Phenomena Vicissitude includes a spell name to provide just enough information as to what it might do, a requirement of the spell that must be offered to cast the spell, and finally the glyph which is mostly just for show in the grimoire. Imagine handing a scroll or a whole tome of these to a player! I know I would be excited to delve into it.
To create spells like the one depicted in figure 1 you can use the process described in the download at the bottom of this post. It should be noted that I have taken aspects of the design out that related to the solo RPG for your convenience of generating spells without becoming bogged down in other details. For this, you will need a set of playing cards with both Jokers removed, some paper, a pencil, and a mind for the dark arts.
I know elements of this process can be a tad vague but that is by design to allow flexibility in the interpretation of spell names and glyph-making. Hopefully, I can find the sweet spot before releasing the solo RPG. In the name of the RPG community, I hope you find this helpful and I would be happy to receive some feedback as I do know that these things can be difficult to describe to someone else who has not been working on it and some of those tables are large which can make them difficult to read.
This link will take you to Dropbox so you can download the document: Opus Phenomena Vicissitude