Chief

The Chief is an NPC in Vanadis (@jump 135 75) whose roles take place in chapters 4 and 5.

After talking to the Villagers, you can talk to him to learn about the Magnificent Seven.

If you form a party of at least 7 online members, he will allow you into Sunken City (van_dun01) where you can summon Shell King and retrieve the Evolution Stone.

In Chapter 5, he will ask you to warn the General about Cursed monsters.