By succeeding at a Spellcraft check, you can determine specific types of spells as they’re being cast or while they are in effect. You can also pinpoint magical auras in this manner, or decipher the magical writing on scrolls without casting read magic.
Task Spellcraft DC
Identify auras while using detect magic .......................15 + spell level
Identify properties of a magic item using detect magic ..15 + item's caster level
Identify a spell as it is being cast .......................15 + spell level
Decipher a scroll without using read magic ...............20 + spell level
Identify a spell effect that is in place ...............20 + spell level
Identify a spell that just targeted you .......................25 + spell level
Action: None, in most cases. Deciphering a scroll is a full-round action, and attempting to identify the properties of a magic item takes 3 rounds per item.
Try Again: You can retry checks to identify a spell. When using detect magic and identify to learn the properties of magic items, you can make only one attempt per item per day.
Perception Penalties: Attempting to identify a spell as it’s being cast incurs the same penalties as a Perception check due to distance, poor conditions, and other factors.
