
GM Rednal |
Most anything can become unbalanced if you set out to make it that way. If you avoid things like supercharging your save DCs or damage amount, though, you should be fine. ^^ There's a lot of built-in limitations that make it so you usually can't stack things too far anyway.
If you want an extra limitation, you can tell people that their Spheres have to be separated by class. So if somebody's a Shifter/Incanter, for example, their Shifter talents use their attribute and save DC's there, and their Incanter Talents get the full CL progression - but they can't be mixed. (So you couldn't learn Alteration Talents as an Incanter)