As you continue your way through the dark and wet area you will eventually find yourself in a room with a switch on the floor along with several Skellies to take care of.
Despatch those fiends and head towards some smashable skulls as its blocking the path, continue onwards to a block that you can move with the Hammer.
Hit the Block so it falls to the floor and descend down. From there again push the Block onto the switch on the floor, doing so activates another sword statue up above. Now using the ‘Salvation’ hit all 3 of the Sword Statues so they change red.
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