Summoning Lair Bosses
Lair bosses are special bosses in each zone designed for about 3-5 players to summon. The boss is locked to the group that summons it, meaning the loot will belong to the group, regardless of how much damage any outside players may do in attacking it.
First you must farm or acquire the particular 9 blueprint pieces for that lair boss and assemble them in the proper position (when positioned properly the pieces will form a picture of the boss). Next, bring the assembled summoning ritual to a summoning circle for that zone and activate it. When used, a heart will appear with an anima link toward you. The other players in the group can accelerate the summoning by moving close to help you.
After successfully using the summoning ritual, the 4 flames of the circle will light, representing 4 tries to down the boss (may be only 3 if bugged). If the entire group dies during a try, the boss returns to the summoning circle and will remain there for 5 minutes, and 1 flame will disappear. When no flames remain, a new summoning ritual will be needed.
When the lair boss is killed, it will drop 2 Bind on Pickup rare items, 1 rare signet, 1 rare glyph kit, and 2 region boss blueprint pieces.