first need to get in to slums of lighthalzen keep talking to npc at lighthalzen 265 200 or by doing the friendship quest inlighthalzen and just talk to him once after that.
then to lighthalzen 321/218
Ask him about the Tomb of the Fallen: Gives background and story information about the dungeon.
Return to the Tomb of the Fallen: Enter the dungeon by paying 100,000z, and appear at lhz_dun_n 98/201 (western side of the dungeon). Note that there is no confirmation. As soon as you select this option, your money will be taken and you will be warped.
Say 'That's too much zeny': Be granted an option of paying 10 Research Charts to enter instead
another way is the girl alittle south of first npc lighthalzen 320/204
Go where the monsters roam: Pay 150,000z to enter the dungeon. She will make you appear at @navi lhz_dun_n 162/254. This room is often plagued with monsters however, if you can muster it, you will be able to use the Questionable Device in the top right corner of the room by walking up to it where it will restore you to full HP once and avoid the higher cost of the 2nd method. You are unable to interact with the enchanter, old headgear creator and soul exchange NPCs however and will have to make your way through the often congested area of the dungeon.
Enter the Sanctuary: Pay 2,000,000z to enter the Sanctuary, a location in a separate map that contain copies of all four NPCs used to enchant and create Old Headgears, trade same type souls for one soul of choice and access to Storages (Doram Kafra NPC).
What kind of place is it?: Gives background and story information about the sanctuary location.