I'm running a game and my players entered a room which was under the effect of a Mirage Arcana spell to make the room look nice. One of the players cast detect magic. Does this reveal the illusions?
I'm wondering because I can't justify a 0th-level spell overcoming all illusions. Does illusion magic have any built-in protection from detect magic (true sight and arcane sight are not being asked about)? Also, I am not asking about invisibility, but disguise magic should also be included.