This pair of boots roots your connection to your patron as an inseparable bond. This is to such an extent that your patron will potentially come to you aid.

Otherworldly Intervention: Whilst attuned to and wearing these boots you can use an action to call on your patron to intervene on you behalf when your need is great. Describe the assistance you seek, and roll percentile dice. If you roll a number equal to or lower than your warlock level, your patron intervenes. The DM chooses the nature of the intervention. If your patron intervenes, you can't use it again for 7 days. Otherwise you can use it again after you finish a long rest. At 20th level, your call for intervention succeeds automatically, no roll required.

Notes: Warlock