The idea of zine-format spellbooks has been on my mind for a while now. On one hand, they provide a great supplement to the character sheet for spellcasting characters, and on the other, as a GM, it’s much easier to hand a filled-out booklet to players if they find a grimoire in a dungeon or defeat an enemy wizard. These mini spellbooks are designed for the Old-School Essentials system, with each of the six arcane spell levels having a dedicated page in the booklet. Players can easily mark off memorized spells, keeping track of them with ease.
Cutting and folding zine booklets are nicely demonstrated in this video: https://www.youtube.com/watch?v=sLuLjRFXv_U