Dubious Knowledge

You're a treasure trove of information, but not all of it is from reputable sources.

• You gain proficiency in two skills of your choice, or expertise in one skill of your choice.
• Once per long rest, you can choose to call upon your Dubious Knowledge to gain advantage in a check to recall information, no matter how obscure.
• When you fail a check to recall information using a skill you are proficient in, you learn one bit of true knowledge and one bit of erroneous knowledge, but you don't have any way to differentiate which is which.