"Hello everyone."
"Welcome to the Adventurers Guild. We have bad news to tell you guys."
"A group of people are trying to take over Avalon, and they will attack in two days."
"We need your help to defend our dear Avalon from their attacks. After the attack is done, we will give generous amounts of rewards to those who manage to participate in defending the place."
The Adventurers start talking with each other. Some are excited because the promised rewards are decent, some feel it's the time for them to shine, and some stay quiet and listen carefully.
"Do we know who they are?" Ask one of the adventurers.
"Yes. They are the same hooded groups that attacked here a few weeks ago."
Knowing the enemy's identities, some of the adventurers start having confidence. The power of the hooded groups from before is not poor, but not as strong as A or S-level adventurers.