itch.io

An example, huh? Let me find my dice...

Ok, I rolled up "summoning disc". I have two ideas about how this spell could work. 

First, maybe it makes the person regurgitate a CD-rom that can be used with a computer to summon a person- maybe the disc contains a summoning program like in shin megemi tensei or whatever, that could be used if the players want to bring back an NPC that got killed or they just want to meet again or something like that. A mutation for that could involve the character's voice becoming computery- maybe their speech is bitcrushed, and a more severe form of the mutation could involve people not being able to understand them because their speech is too staticy. Or maybe a bad version of it involves their throat getting infected with malware, and sometimes when they try to talk they advertise penis enlargement pills or something like that.

My second idea is that when they use "summoning disc", it creates a disc (maybe they make a circle with their arms?) that a creature of some sort can get extruded out of. Maybe a friendly creature? Or if the casting goes badly it could be an enemy. A mutation for that could be all their flesh around the edge of the "disc" becoming discoloured or patterned or growing coral-like protrusions or something like that, or maybe some trait of the creature that was extruded from the disc. You could calibrate how much of a problem that is depending on how the roll goes, I suppose.

It's really just an oppurtunity for you to mess with your players, maybe introduce some body horror if you feel like it. Not every mutation needs to create a massive change in the character's life. And if it doesn't appeal to you there's no reason why you should linger on it too much or even include it at all...