Hollow Parts

Hollow Parts is the umbrella name for the mob-part materials that drop from the game's hollow enemies. Each part is tied to a specific hollow (or a small set of them), so 'what drops this' is always answerable - and farming a specific part means farming a specific enemy.

Sixteen parts are currently documented. Straightforward one-to-one drops include the Toad Eye (Toads), Scorpion Venom (Scorpions), Mammoth Tusk (Mammoth), Bear Mantle (Bears), Turtle Shell (Turtle Hollows), Centipede Antennae (Centipede Hollows), Mantis Thorax (Mantis), Penguin Flipper (Penguins), Bat Wings (Bats), Panther's Paw (Panthers), Lizard Blood (Lizards), Wendigo Skull (Wendigos) and Monster Iris (Lickers).

Three parts have multiple sources: the Fur Pelt drops from both Panthers and Bears, the Electric Core from Jellyfish and Armadillos, and Crocodile Scales from Crocodiles as well as King Croc. Note that Crocodile Scales (the hollow part) are distinct from the King Crocodile Scale boss material used in the Guardian of the Gate quest. These parts feed quests and crafting across the game, so a habit of picking them up while grinding pays off later.