3. Return to Geffen Tower and talk with Summoner Bentham, who offers to summon boss monsters for you to challenge in exchange for certain items (see Summoning Materials).
Summoning
This quest or instance can be repeated.
This quest or instance has a 30 min cooldown period.
1. With the neccessary items in your inventory, talk with Summoner Bentham, then choose a monster to fight.
2. Enter one of the two waiting rooms.
3. When you are transferred to an arena, talk with the NPC to summon the monster.