Amber sent her letter using a magic communication tool. Hopefully, she would get an answer soon, and a few days after that, reinforcements would arrive. Although the guild could mobilize the explorers under its jurisdiction, the ones close to Yellow Sparks were mostly first and second level ones.
From what Toz had told Amber, using low level mages would at most halt the rats in their advance. To eradicate them, they needed greater levels of strength and possibly greater numbers.
Amber stressed this point in her message, but she didn't possess the qualifications and authority needed to make a mid level mage of the guild move by herself. She could only hope that even if they wanted to verify the truth before sending further reinforcements, they would send someone with adequate strength and skill to start planning countermeasures.
