Book:Special Powers
Bedtime tales tell of the mysterious abilities held by legendary heroes and villains. The power of sorcery at the hands of the wizened old wizard, the strength in the fists of justice belonging to the humble martial artist, and the spirit of rage in the berserk soldier who coldly cuts through lines of his enemies are all examples of Special Powers.
A Special Power is a supernatural ability possessed of a character: Spellcasting for example. Special Powers have 5 ranks and each rank is more costly than the previous. If a Special Power lists that its ranks cost 1, 2, 3, 4, and 5 Expoints, you end up spending 15 to attain all 5 ranks.
It is strongly recommended that a character not be allowed to buy more than one rank at once. For instance, a starting character cannot have more than one rank in a Special Power, nor can a player stockpile Expoints to purchase more than one rank at once. Like all rules, this can be waived at your GM's discretion, but it seems to help balance starting characters.