Lost the first part of the video, but there's plenty of others that show how you get in.
Just some solo semi-cheese (on PS4). I like to immediately get rid of the 3 wizards right off the bat, but that's just laziness, they're not hard to kill. It’s easier to chill not getting shot while waiting for the sword's super to charge. The basic attacks are more risky than they're worth, tends to get you hit, and the knights hurt.
After beating the knights, watch out for flying debris when jumping through the final platforms. You don't have to take the route I did, there are bigger platforms on the right side, I believe these small rocks are the left side route.
And you MUST bring the sword to the end with you to get the chest.
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