The once-ordinary street lights that adorned the witch city's thoroughfares underwent a magical metamorphosis as the witches fortified their defenses against the encroaching threat of the troll army. No longer just sources of illumination, these street lights became sentinel guardians, vigilant protectors infused with powerful enchantments.
Witches gathered around each street light, their hands weaving intricate spells into the very essence of the lamps. The lights were imbued with the ability to detect any malicious presence, serving as the city's first line of defense. When trolls approached, the enchanted lights flickered in response to their malevolent aura, emitting protective auras that shimmered like ethereal shields.