|Effect||Block a hit once in a while|
|"Being invincible once in a while is better than never at all." - Proverb|
It blocks one attack per room and reappears when the player enters a new room. It negates almost all types of damage (including from Sacrifice Rooms and Purge Potions), except Mortar's beam attack and fire damage from landing on a torch. Blocking hits prevents status effects from afflicting the player (e.g., a Spider's poisonous bite or projectiles from Waking Light-affected Torches and wall lanterns). Blocking a hit prevents the Intensifier's effect from resetting.
When the Nullstone disappears any Will o' the Wisps on the player will be removed.