Question about learning spells

[The Majestic Leper]

A player of mine wants to learn the light spell. For his first reading, he tests sorcery vs. ob of spell. I'm a little confused as to what that is, for in this case the spell lists "see description" as it's ob. The effect states it varies based on the intent with ob 1-10. What does this mean? Was the ob suppose to read 1^? If so, what is the ob for a spell like that? or should I have him roll for a ob 10?

[luke]

variable obstacle spells use the average obstacle. In this case, Ob 5. I think that's stated more clearly in the abstractions chapter, but I know it's in there somewhere.

hope that helps.
-L

[Kublai]

Light is a VERY hard spell to learn, ain't it? :shock:

[Lxndr]

That sort of light spell, yes.

There's another fixed-obstacle light spell in there somewhere that's a lot easier, but without my books I forget the name of it. It doesn't have the ability to cause THE BRIGHTNESS OF THE SUN, though.

[The Majestic Leper]

Thanks for the clarifacation.