Spectral Eye Amulet

Switch it on with right-click; while it is in your inventory you see mobs through walls. A Nether Star, an eye of ender, two Deorum Ingots and string.

Other useful items, in the Forbidden and Arcanus guide

Tick what you already have.

radio_button_uncheckedMark as already had×3String

radio_button_uncheckedMark as already hadNether Star

radio_button_uncheckedMark as already had×2Deorum Ingotsync_problemgathered, not crafted

radio_button_uncheckedMark as already hadEnder Pearl

radio_button_uncheckedMark as already hadBlaze Rod

radio_button_uncheckedMark as already hadBlaze Powdergrid_viewCrafting table, +13 more

radio_button_uncheckedMark as already hadEye of Endergrid_viewCrafting table, +3 more

Spectral Eye Amuletgrid_viewCrafting table