I had been playing with this idea before SR4 and is part of the campain background "stuff we did not know about magic".

So here are the rules,

Edge 4 pts

Works like the innate spell critter power, run off essence as magic and sorcery, but has drain per normal rules.

i would consider it fluff wise like being a surgeling. i think its alright though.

its nice to see people adding things to the game instead of subtracting or modifying.

I have added plenty - multiple new Metamagics, Spells, Weapons Systems, Adept Powers, & even a few Qualities. This is of course all for SR4.