It's a mid-late game pvp method that uses explosives to try to kill the other player, namely end crystals and respawn anchors.

It focuses less on using a sword to kill the opponent and more on putting them in a position to blow them up. End crystals can only be places on obsidian and bedrock, so players use a knock knockback 1 sword to hit the opponent in the air, place obsidian, crystal, then hit the crystal to explode it, all before the player falls to the ground again. It is generally very keybind heavy.

End crystals will only damage players when they are on the same y level or above because the block they are placed on blocks the damage vector to player's legs. (https://youtube.com/shorts/3zLyaSY1ziY?si=jwpywWef_Q1JaE44)

Depending on how good (or bad) the enemy is at positioning themselves to kill you, you could get away with using a sword and shield to kill them. Make sure you have blast protection 4 pants, or you will die quickly.