The Harrowing Reach puzzle does not require the western lever if you have a Spiderfriend perk or the Webwalker racial passive (acquired by high Drider transformation). These traits let you bypass the chasm entirely via a hidden web-bridge. You only need 3 of the 4 levers to unlock the chest in current patches.
Rare potions that provide permanent increases to Strength, Libido, or Intelligence. Pro-Tips for Puzzle Solving corruption of champions 2 chest puzzle