Item from Fullmetal Alchemist by Hiromu Arakawa
A metaphysical portal that appears during forbidden human transmutation — it grants the alchemist total knowledge of alchemy while extracting an equivalent toll from their body or abilities.
An enormous stone double-door covered in intricate carvings and alchemical symbols, standing in an infinite white void. When it opens, darkness pours out — a swirling mass of shadow-hands and countless eyes that drag the alchemist inside and disassemble them to show them everything.
Also known as: The Gate, Gate of Truth, The Portal