As a bonus action, you willingly open your mind’s eye to bear witness to the mysteries beyond the veil for the next minute. During that time: 

• you deal an additional 1d10 radiant damage per attack,
• gain resistance to psychic damage,
• cannot be charmed, mind-controlled, or put to sleep through magical means.

After a minute, your mind’s ability to process the enormity laid bare to you deteriorates, and you lose 15 Sanity and are unable to use this feature until you complete a long rest.