Linkable Block

A Linkable Block looks like a block of obsidian. It has two inventory slots: the middle can take a Linked Pearl or a Linked Resonant Pearl and the lower right will take a block. The Linkable Block will imitate the appearance of any block placed in the lower right slot. Any entity that walks across the Linkable Block while it contains a pearl will immediately be teleported to the location where the pearl is linked. The can be disabled with a redstone signal.