Stop the rebellion! [C rank]

Name: Stop the rebellion!
Rank: C
Location: Magnolia
Client: City Council
Target: Rebels
Reward: 2000 EXP and 5000 Jewel
Details: The city council have caught news of an uprising being planned. It's your job to ruin the meeting. Their intel told that the meeting will be held in a building at night. Arrest the conspirators, and bring them to justice, so that the city council can scare away other conspirators! There are 3 D-ranked Guards and the boss, which is a C-rank. The 3 lackeys aren't mages, but the boss is a fire mage.