The DC to
Identify Magic or
Learn a Spell is usually the DC listed for the spell's rank or the item's level, adjusted for its rarity. A very strange item or phenomenon usually uses a higher DC adjustment. For a cursed item or certain illusory items, you can use an incredibly hard DC to increase the chance of misidentification. If someone has already identified the spell or item, it's best to either let them automatically identify it or apply an easy or very easy adjustment.