Abzorbaloff's cane
From Tardis Wiki, the free Doctor Who reference
In 2007, the Abzorbaloff carried a cane which, as the Tenth Doctor was aware, created a limitation field to control his abilities. (TV: Love & Monsters)
As Victor Kennedy, the Abzorbaloff banged his cane as he found LINDA's website. His secretary arrived, offering a pot of tea, only to be absorbed by the Abzorbaloff. (WC: Tardisode 10)