Fargo's Mod/Abominable Wand

The Abominable Wand is a post-Moon Lord Eternity Mode exclusive accessory dropped by the Abominationn.

It grants immunity to the Abominable Fang debuff and allows you to endure any attack up to 1 health and survive. For 10 seconds after triggering, the player can neither gain back any life through healing or lose life without being struck. In other words, the player becomes temporarily immune to death through effects such damage over time. The ability to endure at 1 health is restored when the player recovers to full life.

It also summons a temporary Spectral Abominationn minion that appears after critical strikes, with a small cooldown. This minion inflicts the Mutant Nibble debuff.

If the is equipped along with this, the cooldown for the hearts spawned by the Sparkling Adoration is halved and the bonus critical damage cap from grazes is increased by 20% for a total of a 50% critical damage cap.

Trivia

 * Abominable Wand and the Spectral Abominationn it spawns are internally identified as Cyclonic Fin and Spectral Fishron respectively. Cyclonic Fin was the drop of Duke Fishron EX before both were replaced with Abominable Wand and Abominationn (boss).
 * The tooltip refers to, of which Abominable Wand is an incomplete piece.