Raids

What is it? A group adventure in a copy of the map just for your party: phases one after another, a boss at the end, and loot dropping on the ground. The strong bring the weak along: above the map's level, you help but don't earn — on purpose.
How do I get it? Form a party, see the raid NPC with a Raid Seal, and accept the entry. Each page states the advised level, the number of players and the lives.