Boon of the Secret Keeper

You gain a special intuition for secrets. You have advantage on Wisdom (Insight) checks. In addition, you can use an action to cast See Invisibility without expending a spell slot. Once you cast that spell in this way, you can’t do so again until you finish a long rest

Learning Secrets
Every time the characters learn a powerful secret, note it on the Secrets Tracker. Once the characters learn a secret, they can’t learn it again. When one character learns a secret, it counts as a secret learned for the whole party.

Revealing Secrets
A character can magically spend a secret like currency, revealing it to the multiverse to gain a momentary boon. To do this, the character must use an action to whisper the secret into the wind. When a character spends a secret, every character in the party gains advantage on d20 rolls for 1 minute.