Vagner is a poet. You can find him at the デットホース亭.
Upon first meeting Vagner he tells you that he wants to impress the ミスチャーム by writing poetry. However・he lacks the resources to write anything.
The poet needs 白紙 (10). You can either make this at the Church Workbench in the 錬金術研究室 from 豚革紙 or in the 作業場 using the 紙プレス機. Alternatively・you can purchase 白紙 from the 占星術師 but it will take several weeks to collect enough considering how little he has in stock. Return to ヴァグナー for 10.
The poet needs インク (1). It can be made at the Church Workbench in the 錬金術研究室 from 黒いペンキ・Glass Cones and 水. 黒いペンキ is produced at the 錬金術作業台（ステージI）. See 錬金術 for more information. Alternatively インク can be purchased from the 占星術師. Return to ヴァグナー for 10.
Vagner tells you that he will trade you a good story 物語 (1) for 赤ワイン (1). After trading he will say "Good wine is my friend! Here's a story.". You can either produce the wine yourself or buy it from ホラドリック among his ステージII wares. This quest is repeatable. After doing the exchange six times・this quest is no longer available. He claims that you have taken all his best stories・leaving him unable to impress ミスチャーム.
ミスチャーム asks you to write her a song. Since you are no poet・you can't do it yourself. You know a poet though・so you ask Vagner if he is willing to help his love. He immediately agrees・but he wants to write not just any song - the best song he ever wrote. To do that he need a special kind of creative boost. So it happens that he knows the recipe - he heard about it in University. And now you do too - 1x 強い酒 and 3x 赤いキノコ・mixed at a distillery・should do the trick. Brew this wonderful mix and bring it to Vagner. He will chug it・smile widely and ask to wait. Come visit him the next day.
Upon visiting Dead Horse the next day you will find a note from Vagner. In it・he asks you to come to the shore near the Mountain Fort at night. When you do・Vagner will emerge from hiding. The special 'creative booster' had a side effect - the more the poet peered into the pure creative abyss・the abyss stared back at him. He didn't waver though and wrote a truly epic song・but now he has an appearance of a monster rather than a man. You try to calm the poor soul・but at the same moment paroling guards stumble upon the two of you. They immediately proceed to capture Vagner・despite your protest that this is no monster. In the end they take him to the Mountain Fort.