What is "unchaining"

Usage examples of "unchaining".

Those people who could request major favors from God—like the Unchaining of nearly sixty thousand Hellspawn, for example—and get God to answer were not people whose damnation he wanted to hear depended on him.

They heard shuffling steps and the elaborate unchaining and unbolting of the door which was finally dragged open with a screech to reveal a small, dirty man wearing pyjamas and an unspeakable overcoat.