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- "We're doing an early warning incantation. If anything hellgodishly powerful comes within a hundred feet of the shop, then screechy siren things will, you know, screech."
- ―Willow Rosenberg[src]
The Early Warning incantation was a protective spell cast around the Magic Box and the Summers residence by Willow Rosenberg and Tara Maclay to serve as a security measure against Glory. The spell would cause a screechy, siren-like sound in the event of the hellgoddess coming within a hundred feet from either the shop or the house.