Defeating the Wandering Wight is much more about preparation and having the right skills at your disposal than anything else.
Instead, let's knock a few things out. First, defeat the other optional boss in the forest, Guangzhi, to obtain your first transformation skill, Red Tide.
This transformation allows you to become Guangzhi and dish out some fire damage while also temporarily granting you a new health bar.
Be sure you've upgraded your armor to the Pilgrim's Set at any shrine to give yourself a bit more defense.
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