The Sky Necklace connects the player's inventory to a selected Sky line through an item whitelist. It requires a whitelist Filter List containing at least one item; it does nothing without a filter or with a blacklist. It works in a Curios slot when available, or from the player's main inventory otherwise.
Three Modes
Extract sends matching player-side items to the line. Insert takes matching items from the line and puts them on the player side. Maintain targets the player's main inventory, inserting shortages and sending away excess. Maintain needs a slot or quantity target above zero.
The necklace upgrade slots accept a Dimension Upgrade for access to same-line endpoints in other loaded dimensions. The maintain target is entered directly; its button switches between item and slot counts, with slots as the default. Slot-count maintenance fills existing matching slots by default without opening slots beyond the target. Server settings may change whether existing slots are filled.
By default, it works about twice per second and tries line targets one at a time. Server settings may change its speed. The necklace does not load chunks; unloaded or full targets wait for a later work cycle.