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Signup to Protect Prontera

Recruiter
prt_in,88,105

Inside the Knight's Guild in Prontera top left corner
Ingredient(s) Product(s)
Not Applicable Red Potion x 3
Milk x 1
Orange Potion x 1
Simply talk to the Recruiter to volunteer. He will give you some subsidies for your effort.

He will warp you to the entrance of the dungeon at the end of the conversation. Just talk to the Culvert Guardian to get in. Next time when you want to come back, just have to talk to Culvert Guardian.