A few more thoughts and suggestions after some play (I think I still have some things to try, like tome combos with the saw and unknown secrets..) I don't mean to intrude on the project, but I thought I'd toss them out in case they inspire; don't feel pressured to acknowledge 'em or anything:
* I'm not quite sure what shrapnel + rings does. Slow close-range ground attack? Will continue to experiment.
* Player death cam almost never has the player sprite in frame when I play. Just noting this as an anecdote.
* Could be neat for the player to have an option to induce freeze deaths. I like that the option to petrify is there.
* It might be amusing to have an effect that turns defeated enemies into rabbits (extra fun if transmuted angels had sprites with design cues to indicate what type it was previously.) Mere ammo pickups, or something else? Who knows.
* Assuming the Angelic Aviary texture pack comes along, it could be neat to have interactions between this mod's magic and certain textures (assuming gzdoom has a function to query tex on hit/use/whatever.. no idea honestly.) I tend to play these mods with obsidian-generated maps, and I'm picturing interactions with randomly-occurring portaits kind of like with the statues..