Garamon

Garamon is a npc north of the entrance of Underworld. You can speak to him. Then he speaks words and you get a quest. The quest when done lets you go deeper into the dungeon without being on the Sacred Quest. The Sacred quest is easier though.

Word	Garamon's answer
Hello	Have a nice day!
Secret	He who pays close attention to the walls may notice something unusual.
Teleporter	You will find many within the dungeon. They will facilitate your travels.
Vines	Aaah yes! Tricky things they are. Try to find something that could burn through them.
Burn	I can tell you right away it's not fire based. Surely something within the dungeon will yield what you need.
Abyss	Its entrance is protected by stone guardians who will only grant passage to the carrier of a Tripartite Key.
Stone guardian	They will not let you enter the Abyss unless you can present a Tripartite Key
Key	Its three parts you must find and reunite as one
Parts	Two can be found hidden in secret rooms within the Underworld. The third you must take from a shadow of evil.
Shadow of evil	A most foul traitor. Once you have the first two parts, challenge him for the third! He dwells beyond the void in the Shrine.
Shrine	Find your way there through the dungeon. You must use a teleporter to reach it.