Locked Door

Guardian of the Lab-rary
Halt, minion! Only those skilled enough may enter when the Master is absent. To protect his projects from foolish bumblers, I am required to test the intelligence of all who wish to pass through my doors Answer my question correctly to gain entrance to the Lab-rary;
What goes through the door but never goes in or our?

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Location: Never World
Note: Available during the 'Guardian of the Lab-Lary' quest.

Thanks to Tendou no Mazo.

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