Its not every day that the people in Drop Dead Studios make a handbook for a whole new Sphere of Magic but here we are. This book introduces the Mana sphere and its uses are pretty general 'make this person better at magic' 'make this person worse at magic' there are some pretty -powerful- options here if the GM allows them like the ability to drain whole Spell points out of other Spherecasters or draining whole Slots if they're a Vancian caster. It might need some tweaking at your table but its a solid book all around with some of my favorite Casting Traditions too.

I really enjoy the thematic behind the sphere and having a sphere all about just pure magic is really cool. I, however, greatly dislike how it plays out in practice and think a lot of the abilities are just very balance breaking for the system as well as the base sphere abilities themselves being way too overloaded.

Both an incredibly interesting, yet easily abusable, sphere was added with this Book. I enjoy the idea of it, but it certainly needed more playtesting.