One of the characters in the group is an aasimar, trying to pass off as a human. The players know the character is an aasimar, but the other characters do not, so to speak, and it drives the players crazy that said player keeps his character's race in secrecy. So, intermingling of this frustration would be out-of-game knowledge.
The aasimar used his daylight spell the other day. The aasimar is a psion, so he normally does not have use of spells; however, daylight is a spell-like ability. One of the players, the cleric/wizard of the group, wants to know if he can make a spellcraft check to decipher if the aasimar used magic or not--would a spellcraft check be able to tell if the aasimar used daylight as a spell-like ability, and would it be able to decipher if there was a difference between a racially used daylight and the daylight a cleric or sorcerer (I don't remember if wizards get that spell or not) could use? (I ask this because the aasimar might tempt to play pretend he has class levels in a class that can cast that spell to hide his race, if he really wants to try to be secretive.)
If a spellcraft check could decipher between the spell-like ability daylight and a psion's normal abilities, then what do you think the DC would be? 15, 20?