Rikki Tikki Traveller said:OR, you could just take the existing Psionic rules, expand the powers a bit (Empathic Healing etc) and you are set with a low magic setting that is ready to go, you just need a map!
I know Jame has produced an expanded list of Psionic powers that fit a "magical" setting very well.
I've also created a Spells list which I think would be a slightly better fit (I should point out that several other people created a few of the spells, though). The psionics list, which I haven't worked on in ages, would make a good raiding point though.
THEN, your magical setting could be tied into a SciFi setting very easily (world isolated during a Long Night event, Lost Colony, etc).
Keeping it as Psionic based would also allow you to have these "magical" characters in a standard SciFi (SciFantasy) setting.
Literature abounds with examples of primitives being swept aboard a space ship and discovering that their little world is part of some vast galactic empire...
This sounds good, but look at this for a moment and make your decision: spellcasters have a Magic attribute (MAG) which replaces PSI, and represents their magic strength. Then they have two skills, Spellcasting and Conjuring. Spellcasting allows you to throw fireballs, bestow curses and such, while Conjuring is the art of summoning spirits and demons, and then controlling them, combatting them and banishing them. As for the source of magic, well ... it's really up to the individual referee, but I would suggest that it's a combination of it being generated by the universe and being used by a magician who's sort of a "magic battery" - every person can be affected by magic, although certain species are harder to influence, but fairly few people can actually use magic. Mind the YMMV rule, of course.
My take would be that simple spells, such as Heal, would be fairly easy to cast (I'd reference the MGT tasks list but I let a friend borrow my copy) while a curse can be of moderate to difficult, while dispelling that curse will be related to the difficulty of the curse as modified by the original curser's Spellcasting skill.