To decipher an arcane magical writing, a character must make a successful Spellcraft check (DC 20 + the
spell's
level). If the check fails, the character cannot attempt to read that particular
spell until the next day. A
read magic spell automatically deciphers a magical writing without a
skill check. If the person who created the magical writing is on hand to help the reader, success is also automatic.
Once a character deciphers a particular magical writing, he or she does not need to decipher it again. Deciphering a magical writing allows the reader to identify the spell and gives some idea of its effects (as explained in the spell description). If the magical writing was a
scroll and the reader can cast
arcane spells, he or she can attempt to use the
scroll.