Crimson Longinus
Legend
To have something that might feel more different from D&D's traditional spellcasting, would be to have more freeform power system. I think something similar to the magic system in Mage the Ascension. Something that resembles more of skill use than spellcasting. So you'd have telepathy, telekinesis, pyromancy, biomancy etc "skills" then there would be various feats and DCs for them. It might cost some resources to attempt this at all, or alternatively you could burn resources to magnify the effect. Like to push a creature back, you roll telkiness with the DC based on the creature's size, and then you can burn power points to push them further or something like this. And of course you could try anything that sounds feasible instead of just the listed effects. But given how barebones 5e skill system is, it would require a lot of work to design a system that would work well like this. And it also perhaps is too divergent and might feel out of place in the game.