Mark of Descent: Thorned Introspect

Granted to Paul within the END Tower of The Never Ending Dungeon.

Thorned Introspect:
The weight of lies in the presence of truth brings only pain.


Effect:

• Once per long rest, when you fail a Wisdom or Intelligence saving throw, you may choose to succeed instead.
  
  When you do, take 4d6 psychic damage as your mind pays the toll for self-deception.

FROM THE MIND OF ADAM LUCAS