First quest at: The Seven Deadly Sins [380, 227]

Gatekeeper [302 230]
Kill one Slifer
At completion you'll be teleported to the The Seven Deadly Sins.

The Seven Deadly Sins
Ice Element (0/30)


Witnesses [390, 232]
Stone Element (0/30)


Witnesses [389, 229]
Primitive (0/30)


The next npc's may be found in the highest room in the tower in Tellus City [398, 230] (behind the Gatekeeper).

The Demon Lililth
Earthen (0/30)


Wrath Satan
Genius Magic (0/30)


Envy: Leviathan
Magic Guard (0/30)


Gluttony: Beelzebub
Strange Tree (0/30)


Greed: Mammom
Blue K (0/30)


Lust: Asmodeus
Brown K


Pride: Lucifer
Queen (0/30)


Sloth: Belphegor
Spirit of the Stone Forest (0/30)


Wrath Satan
Ice Fire Element (0/30)


Apollyon: The Destroyer
Kill Mask Man (0/30)

Soul for a Soul - to get the reward.