The Tongue

The Tongue is a debuff inflicted by the Wall of Flesh when one of the following happens:
 * The player gets stuck behind the Wall of Flesh.
 * The player attempts to leave The Underworld when the Wall is alive. (The player dies instantly if using a Magic Mirror to escape The Underworld.)

When afflicted with this debuff, the Wall draws in the player with a tendril, ignoring blocks in the way, and deals severe damage to the player.