I really hope that you have already done this, before getting to the puzzle.
1. Beated all previous DLS bosses.
2. Bought a Broken Relic Charm from a pig-shop for 1 coin.
3. Put on the Charm.
4. AND GAINED SOME MOTIVATION TO BEAT THIS MF.

So here is a Graveyard that can be divided into segments: UP, DOWN, RIGHT and LEFT, as well as a combination of these sides. Just look at the picture. It's not difficult.

Go to the champions on the top of the map. We look at what they say. Everyone has their own INDIVIDUAL dialogues, so your dialogs may differ. The boys give you hints.
LOOK ONLY AT THE WORDS UP DOWN LEFT RIGHT, ignore other words.

First, we ask the winner in the middle, then the guy on the left, and the last one on the right. Just look at the example.

The first one, in the middle, says DOWNRIGHT
The second one, on the left, says UP RIGHT
The third one on the right says UP
Go to the Graveyard and interact with the graves in the same order we asked Champions. Press Enter on the grave, and a blue ghost appears. As in the picture. If you interact in the right order, the portal openes.
YOU DID IT. BEAT HIM UP.

1 - UP
2 - DOWN
3 - RIGHT UP
Repeat what dudes said and - Voila! Everything worked out, the portal is open.

Yes! Everything is actually so simple. YOU AND I ARE NOT STUPID, WE ARE JUST TOO SMART FOR THIS WORLD.

If you like the guide, don't be shamed to use thumb up, young cupheads and magmen. And if you really love my hard work - send a reward)))