Quote Originally Posted by Curmudgeon View Post
You're finishing the casting of the spell. You can't do that unless you're actually a spellcaster.
Perhaps in rules-ese that's true, but it's not obvious from reading the sentence as plain English. You can finish building a bookshelf without being a carpenter, if all that's left to do is stick the screws in the holes and turn them with a screwdriver. Finishing the spellcasting could be no more difficult than executing a .EXE file after someone else has already programmed it; the program isn't finished until it starts running, but all the parts that require technical skill have been done for you.

A 550
  • Decipher a Written Spell: always, unless the user has used Read Magic or some other equivalent deciphering system
  • Use a Scroll: always
  • Emulate an Ability Score: if the scroll user doesn't have a high enough score in an appropriate spellcasting ability.
So 1 check if the scroll is deciphered and you have sufficient Wisdom, the same as if the spell wasn't on your class list? Or do rogues using ranger scrolls need a fourth check to emulate that part of the routine?