|“|| Find my three Dead Lords, and wake them from their slumber. This will bend them to your will.|
— The Lord of Bones, granting Death the Interdiction ability.
In practice, once the Phariseer has been defeated, Interdiction allows Death to call upon him while standing on special summoning circles. Then, he can order him to switch levers, pull or push cranks, and press buttons (by transforming into a statue while upon the button). This also applies to the Judicator and Basileus. This is necessary to solve puzzles encountered in the Kingdom of the Dead, as the Dead Lords can become intangible and pass through grates and doors, similarly to the way Dust can follow Death anywhere (Curiously, although there are puzzles that require the help of both the Phariseer and the Judicator, it is never required to call upon Basileus). The Dead Lords, if summoned, will also help Death do battle with hostile enemies nearby, which is helpful, but they too have their own set health bar, and should they take too much damage, they flee from the battlefield to recover; at this point Death can simply return to a summoning circle and re-summon them.
Once Death has recruited all three Dead Lords, he returns them to the Lord of Bones, who promptly executes all three of them for betraying him. At this point, the Dead King removes the Interdiction ability from Death, though with the Dead Court slain, it wouldn't have been useful anyway. In exchange, and possibly as a reward for his help, the Lord of Bones grants Death a new ability, Soul Splitter, which allows Death to utilize similar abilities to Interdiction all by himself.