The character discerns spells and magical properties present in a creature or object. One property, spell, or power is revealed each round, from lowest level (or weakest power) to highest (or strongest). For each spell or power, the character makes a caster level check (1d20 + caster level). If the result is equal to or higher than the spell's or power's caster level, the character identifies it. Otherwise, the character fails to identify that spell or power, and the character can check for the next one next round.
Analyze dweomer does not function when used on an artifact.
After the character analyzes one object or creature, the spell ends, even if its duration has not expired yet. Casting this spell is physically taxing; The character must make a Fortitude save (DC 21) when the spell ends or be exhausted and unable to do anything but rest for the next 1d8 hours.