Refinery:

Drop down, loot a [WOODEN BARREL] at the base of the stairs and another [WOODEN BARREL] on the stairs.

A group of Majini's will attack, including one that transforms into a Cephalo. Deal with bowmen and avoid proceeding too far to prevent more Majini's from appearing.

Climb the ladder and loot the contents of two [WOODEN BARRELS].

Turn the valve to stop the incineration flame to the north.

Kill the handful of Majini's that appear immediately after.

Be aware of bowmen on the upper platform to the northeast and one with dynamite.

Search the other side of the upper platform with the valve to find a [JEWEL BEETLE] on the back of the structure.

Explore the area the enemies came from, which contains two [WOODEN BARRELS].

Climb the ladder, then use the lever to summon the zip line. Only one person can use it at a time.

As soon as the first person lands on the other side, a Chainsaw Majini appears. The other player should get across quickly.

Jump down to lower ground for more space and defeat the Chainsaw Majini; he will drop a Venom fang.

Use the zip line again to return to the platform with the valve and loot two [WOODEN BARRELS].

Turn the valve to stop the right incineration flame leak to the east.

Explore the southeastern part of the area to find a [WOODEN BARREL].

Use the zip line here after calling it with the lever.

At the other end of the zip line, loot a [WOODEN BARREL] and find the last valve which turns off the left incineration flame leak to the east.

As soon as you unlock the door, another Chainsaw Majini spawns. Consider waiting for your partner.

Exit the small area and deal with the Chainsaw Majini downstairs.

Exit that area and kill the regular Majini's that spawn.

Loot a [WOODEN BARREL] on the walkway to the exit.

Hop down, smash the last two [WOODEN BARRELS] and exit to the next area.

After the scene, provide cover (press the cover button to crouch behind walls or objects) for Josh and kill the large group of Majini's that enter the area. There are about 4 [WOODEN BARRELS] to loot.

Some Majini will try to enter through windows; use the window slashing technique with your knife while your partner covers you.

When the elevator arrives, board it.

In the next area, proceed to the end. You will find 2 [WOODEN BARRELS] along the pathway and another 3 [WOODEN BARRELS] at the end.

Cover Josh as he tries to open the locked door. Backtrack slightly to keep enemies, including a Cephalo and a Chainsaw Majini, away from Josh.

When the door is open, make a run for it; do not try to kill all enemies as they keep respawning.

Go downstairs and hop through the window to your right to enter the room the Majini's were in first.

Loot the two [WOODEN BARRELS], hop back out, and proceed to the next area, the docks.