Theo R Cwithin
I cast "Baconstorm!"
Spellbooks are touchy, unstable things.
Copying a spell (from a scroll, spellbook, or whatever) into your own spellbook risks damaging/destroying your own spellbook. (Could be an arcana check or something, and failure erases 1dN random spells from the book?)
This risk drops as more time and expense is put into completing the copy. This risk rises the more complex (higher level) the copied spell is, and the more complex (total spell levels) your own spellbook is.
This represents the wizardly research needed to ensure the "energy [insert arcanobabble] frequencies" of a spell from an unfamiliar source aren't too dissonant with your own spellbook.
PCs can still do the copies, but there's a huge risk... but that risk can also be mitigated with enough time and drop a lot of coin.
Copying a spell (from a scroll, spellbook, or whatever) into your own spellbook risks damaging/destroying your own spellbook. (Could be an arcana check or something, and failure erases 1dN random spells from the book?)
This risk drops as more time and expense is put into completing the copy. This risk rises the more complex (higher level) the copied spell is, and the more complex (total spell levels) your own spellbook is.
This represents the wizardly research needed to ensure the "energy [insert arcanobabble] frequencies" of a spell from an unfamiliar source aren't too dissonant with your own spellbook.
PCs can still do the copies, but there's a huge risk... but that risk can also be mitigated with enough time and drop a lot of coin.