Zelda Tears of the Kingdom: Phantom Ganon (Deku Tree)
This boss isn't required (as far as I know) but if you want to get the master sword this is your best way to start. First you need to make your way to the Great Deku Tree (you'll have to go underground and ascend from the depths)
Then simply dive down and kill the 5 eldritch Horrors after that it's time to face phantom ganon who thankfully has a very simple moveset of just horizontal, vertical, and spinning slashes... then it also dissolves into mist to do a really powerful attack against you.
After killing it you'll be given the location of the master sword except... it's moving.
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