- 01
Head back to Elias at the Uzer Oasis with the plans and key.
- 02
Make your way to the entrance of Zemouregal's Base north of the Digsite and talk to Elias again.
- 03
Enter the base and run through the dungeon until you reach the kitchen (marked by the icon). Enter the kitchen through the gate.
- 04
Wear your insulated boots, then enter the sewer system via the pipe on the southern wall.
- 05
Enter the other end of the pipe at the very end of the path.
- 06
Head into the southern room and search the western table for some decoder strips.
- 07
Open the chest for the code key. Read it and take note of the four-letter code.
- 08
Head back and attempt to open the metal doors to the east.
- 09
Enter your code key in order on the decoder strips in the interface that pops up.
- ↳
Each strip will be associated with a number, 0-9, and will have an order, 1-4 on the left hand side of the strip. Use the up and down arrows to enter the number, using the right arrow to enter each number once picked.
- 10
Equip your crossbow and mith grapple, then click on the metal bars above the fire traps to climb over them.
- 11
Attempt to take Arrav's heart to begin a cutscene, after which you'll fight him. Activate Protect from Melee to reduce his damage.
- ↳
Every three attacks, Arrav will swing his axe in the direction he's facing, dealing up to 26 damage; move adjacent or behind him and resume attacking. You can also unequip your weapon and position yourself to face Arrav whilst being behind the axe; this results in you catching the axe and dealing additional damage.
- ↳
Armoured zombies will also spawn with 10 Hitpoints each, leaving behind venom pools wherever they walk. Stepping on these will inflict venom and deal up to 4 damage every tick if not moving.
- 12
Upon defeating Arrav, finish watching the cutscene and the ensuing dialogue afterward to complete the quest.