Greetings Rohanians!
1. Talk to NPC Taru located in the entry of Gratt's Underground Waterway to enter the Underground Upper Level.
2. There are some NPCs inside the Underground Upper Level, these NPCs have chain quests starting from NPC Tamor.
-NPC Tamor (To Achieve Peace-repetitive): Kill 150 Upper-Level Revenant Knights and 150 Upper-Level Dark Under Knights. Report back to NPC Tamor. The reward is 1 Corroding Key. The second part of the quest is killing 100 Upper-Level Revenant Knights and 100 Upper-Level Dark Under Knights. The reward is 2 Corroding key fragments.
-NPC Tamor (Reason for Creasing to Exist-repetitive): Kill 150 Upper-Level Revenant Terrors and 150 Upper-Level Dark Under Terrors. Report back to NPC Tamor. The reward is 1 Corroding Key. The second part of the quest is killing 100 Upper-Level Revenant Terrors and 100 Upper-Level Dark Under Terrors. The reward is 2 Corroding key fragments.
-NPC Klaina (Survival Training-repetitive): Kill 150 Upper-Level Revenant Killers and 150 Upper-Level Dark Under Killers. Report back to NPC Klaina. The reward is 1 Corroding Key. The second part of the quest is killing 100 Upper-Level Revenant Killers and 100 Upper-Level Dark Under Killers. The reward is 2 Corroding key fragments.
-NPC Klaina (God’s Goal-repetitive): Kill 150 Upper-Level Revenant Armors and 150 Upper-Level Dark Under Armors. The reward is 1 Corroding Key. The second part of the quest is killing 100 Upper-Level Revenant Armors and 100 Upper-Level Dark Under Armors. The reward is 2 Corroding key fragments.
-NPC Sirai (Researcher’s Reward-repetitive): It will take 4 Corroding key Fragments and in exchange, it will give a Corroding Key.
These keys work for opening Secret Boxes of Underground Upper Level and get some random Split ítems.
Best regards,
-R.O.H.A.N.: Eternal Vengeance Team
Vengeance Never Ends