[Charlie Green]

I got one question , as I read it there's no limit on how many bounded spirits may give Aid sorcery to one spellcasting.
If the mage used edge and a bounded spirits of the correct type, the dice pool can achieve huge proportions, without any limits on how many hits can be achieved.
Did  I missed any errata or rules clarification?

[Morg]

A magician may only have a number of bound Spirits equal to their charisma and if the GM thinks your abusing the game mechanics there is an optional rule were the GM applies a -2 to all actions for each bound spirit past the first you try to use at the same time

[Billy_Club]

There is also the optional (but we always use it) rule that caps dp's at 20 or twice skill+stat, whichever is higher. Edge could still take you higher but it would still allow for a reasonable representation of your character's awesomeness without allowing crazy mechanic exploitation.

[Charybdis]

There is also the optional (but we always use it) rule that caps dp's at 20 or twice skill+stat, whichever is higher. Edge could still take you higher but it would still allow for a reasonable representation of your character's awesomeness without allowing crazy mechanic exploitation.

Interesting Optional Rule...where is it from?

Note: It wouldn't work for our group, my PC in particular.
With a reaction of 2, plus partial cover you're now already rolling 4 dice... any added bonuses like running etc would be capped under this option, as they exceed the (2x (Skill+Stat)) maximum

[Chaemera]

Charybdis, the 20 or double skill + att optional rule is found on page 61 of SR4A, "Dice Pool Modifiers".