# Catalyst Slots

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an item that allows you to craft certain things

<table data-view="cards"><thead><tr><th></th><th></th></tr></thead><tbody><tr><td><p>Undead Slot</p><p>(Undead Heart)</p></td><td><mark style="color:purple;">Star Level 2</mark></td></tr><tr><td><p>Dark Slot </p><p>(Warden Heart)</p></td><td><mark style="color:purple;">Star Level 7</mark></td></tr><tr><td><p>Nightmare Slot</p><p>(Nightmare Fuel)</p></td><td><mark style="color:purple;">Star Level 19</mark></td></tr><tr><td><p>Magic Book Slot</p><p>(Book of Books)</p></td><td><mark style="color:purple;">Star Level 26</mark></td></tr><tr><td>Ore Expansion Slot<br>(Ancient Blueprint)</td><td><mark style="color:purple;">Star Level 9</mark></td></tr><tr><td>Iridium Expansion Slot<br>(Iridium Catalyst)</td><td><mark style="color:purple;">Star Level 18</mark></td></tr><tr><td>O<br>(Enderite Catalyst)</td><td></td></tr></tbody></table>