I used to read the bit about power foci increasing magic rating for determining the maximum spirit force that can be summoned as nonsense (as there is no maximum on the spirit force you can summon normally).

I just realised, however, that that rule could apply to watchers where there is a force limit based on magioc rating (maximum force <= magic attribute/2 rounding up).

Have other people used this? Am I just stupid to miss it for so long? I'm just wondering what other people think of it. Is it allowed? Would you allow other power foci-like things (power-sites/lines or an ally spirit's aid power) to have the same effect?

That's how I read too and that's how I played it.

Have to agree. And if you have MITS, it ain't that hard to do it yourself.

That maximum force that you can summon is Magic x 2. It's in SR3, page 188.

To clarify, there is and always has been (as far as SR3 is concerned, I cant speak for SR1 or 2) a rule in the BBB limiting the maximum force of any spirit you can conjure to twice your magic rating. The description of power foci did not mysteriously become sensible when MITS was released... it was always sensible.

Power Foci only increases your magic rating for two things - to determine whether drain is Stun or Physical, as well as for determining the maximum spirit force that can be summoned. (pg 190 SR3)

So Lilt, you're right, actually.

I thought it might have been in Rigger 3 revised or something