Congratulations! Each of them will find a potion in a small bottle of a dark purple color in their rooms. Each potion has been "created" from a different body part of the spider, and thus has different effects, not that they know what they are until they try it for themselves. Only a little of the potion needs to be consumed for the effects to take place, so theoretically the potions could be used a couple of times; use your best judgement!

Minato’s potion, made from the jorogumo’s stercoral pocket, will allow the user to read minds for a brief period of time, a maximum of an hour at a time.

Ouni’s potion, made from the jorogumo’s heart, will make the user only tell the truth for the duration that it lasts — about two to three hours.