Methos said:
I'm confused about this comment. Does this mean that an arcane caster could cast a spell from a scroll when the spell was scribed by a divine caster as long as the spell was on both lists? e.g. bull's strength is on both the cleric and wizard/sorcerer lists, so a wizard could use the spell even if a cleric scribed it?
Also, does this mean that wizard could scribe a spell into a spellbook that was scribed by a divine caster on a scroll. e.g. bull's strength from above?
No. With scrolls, the scroll must be of the correct type (arcane or divine) for you to make use of it,
and it must be on your spell list.
However, what you propose
does work if the wizard scribes the scroll, with the cleric providing the spell. Since the wizard is scribing, the scroll is arcane.
If the cleric provides a spell like Shield of Faith, you end up with an arcane scroll of a spell that is on no arcane lists. The only way anyone can make use of it is with the Use Magic Device skill.
If the cleric provides a spell like Cure Light Wounds, you end up with an arcane scroll of CLW. Neither the wizard who scribed the scroll, nor the cleric who provided the spell, can use the scroll... but a Bard (an arcane caster with CLW on his spell list) can.
If the cleric provides a spell like Bull's Strength, you end up with an arcane scroll of a spell on the Wizard spell list - which the wizard can then transcribe from the scroll he just scribed, into his spellbook.
-Hyp.