Well as the rules for this very common practice don't exist and the old 4th Edition ones well were a bit too easy to abuse I thought I would toss out an idea of some 5th edition rules for this.
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The book can if designed have up to 4 glosses, if not designed for glossing it can have only 1. Justification: Books were printed with extra space for glossing if it was intended but otherwise you are writing in the margin.
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A book is rated LvlxQyGaGbGcGd or LvlxQyGa in this case.
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The gloss value (Ga, Gb, Gc, Gd) is equal to the glosser's Communication plus any relevant virtues or flaws. This value can infact be negative.
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A gloss can be written by anyone who has gained a level in an ability or art from reading the book.
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A subsquent reader adjusts the books quality by the value of the gloss.
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In the case of several glosses they are ordered by hightest to lowest and each subsquent glosses value is reduced for quality enhancement purposes by -1*number of previous glosses. No gloss beyond the highest level gloss can reduce the quality of the book however.
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Glosses do not apply ot authorities.
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It take 1 season to write a gloss per 10 lvls in the arts the book has, and per 3 levels in ability it has. In all cases round upwards.
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Time spent writing a gloss is worth 1 xp in the subject of the book and practice xp in profession (scribe).
Ex: Book "On Making Pefection Tangable"
Summae Creo Lvl10Q5
Lets say it was glossed by a Com: 3, Good Teacher Mage
Result: Creo Lvl10Q5G6 giving a learning source of 11.
Lets say it was glossed by a Com: -1 Good Teacher Mage
Result: Creo Lvl10Q5G2 giving a learning source of 7.
Lets say it was glossed by a Com: 3, 1, 1, 1 set of Mages.
Result: Creo Lvl10Q5G3G1G1G1 giving a learning source of 5+3+0+0+0 or 8.
Lets say it was glossed by Com: -1, -2, 1+incomprehensible Mages
Result: Creo Lvl10Q5G-1G-2G0 giving a learning source of:
5+0 (as it is the highest gloss quality)+ 0 (the bad glosses do not contribute) or 5.
Lets say it was glossed by a Com: -2 Mage
Result: Creo Lvl10Q5G-2 giving a learning source of 3.
Lets take an extreme case of glossed by 4 Com: 3 Good teacher mages
Result: Lvl10Q5G6G6G6G6 giving a learning source of 5+6+5+4+3 or 23.
That is a might bit rude especially when read by a "book learner" so the concept of multiple glosses might need to be looked at. In the case you feel that you want to limit the effectiveness I would suggest having no more than 4 glosses and using only the best of them.
Comments?