Decayed Bat

Decayed Bat is a item. It can be given to the Tyashoi Alchemist in exchange for the Great Spook Chestplate

Obtaining
It is obtained by killing bats on the private island with a Wither Bow and Icy Arrows.

Trivia
It's recommended to use runaan's bow to aim and quickly swap to wither bow.

Its drop rate is 100%

You need to place the Roofed Forest Island on your private island