It won't cost anything. Except a safety foam for yourself if you think you will die or want to afk.
The things I can help you with is clearing elga for quests and/or farming 10 nails for your weapon.
Farming rare elga is not an option.
Also you have to be level 70 or higher, being lower than 70 will instantly kill you because you are under the level of the dungeon.
Edited by Agitodesu, 18 January 2016 - 08:16 AM.