Re: One-College Magery and Druidic spells
It looks like a typical GURPS Magic college has at minimum around 20 spells and might have nearly 70, so that's the range where -40% is the standard limitation.
That holds for Birch, Hawthorn, Hazel, Vine/Bramble, and maybe (falling just barely below 20) Holly. The rest probably need a bigger limitation than -40% to be fair.
Heather (Ura) can probably just be treated as single spell Magery (-80%), by the way, since of its three spells the only one you can use without prerequisites from other colleges is Delayed Message.
The rest need to fall somewhere between -40% and -80%.
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