This part of the Nameless Lord quest requires you to first talk to Shimok in the Nameless Town. He is located in a locked room. Shimok requires you to get the Shimok Book filled with Shimok Pages. These drop from wolves on the Nameless Land Surface. Give Shimok the completed Shimok Book and then go to the first Duke Summoner he will now want an Impure Volcanic Ore which can be got from Bandit Lord. This will satisfy the first DukeSummoner and allow you to summon Duke Marvin.