For NoOneBoss

Main.java

package com.minikloon.particlestest;

import net.md_5.bungee.api.ChatColor;
import org.bukkit.*;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.util.Vector;
import org.joml.Matrix4f;
import org.joml.Vector3f;

import java.awt.Color;
import java.util.concurrent.ThreadLocalRandom;
import java.util.logging.Level;

public class Main extends JavaPlugin {
    @Override
    public void onEnable() {
        getLogger().log(Level.INFO, "Registered this gabagool");

        Bukkit.getPluginManager().registerEvents(new Listener() {
            @EventHandler
            public void onSlash(PlayerInteractEvent e) {
                ItemStack inHand = e.getItem();
                if (inHand == null || inHand.getType() != Material.STICK) {
                    return;
                }

                if (e.getAction() == Action.PHYSICAL) {
                    return;
                }

                Player player = e.getPlayer();

                player.sendMessage(ChatColor.of(new Color(237, 81, 255)) + "Slash!");

                World world = player.getWorld();
                Location playerLoc = player.getLocation();

                double lookRad = Math.toRadians(playerLoc.getYaw());
                double lookPitch = Math.toRadians(playerLoc.getPitch());

                Matrix4f mat = new Matrix4f()
                        .translate(0, 1.6f, 0)
                        .rotate((float) lookRad, 0, -1, 0)
                        .rotate((float) lookPitch, 1, 0, 0)
                        .rotate((float) Math.PI * 0.25f, 0, 0, 1);

                Particle.DustOptions dustOptions = new Particle.DustOptions(org.bukkit.Color.fromRGB(181, 0, 9), 1f);

                for (double t = 0; t < 210; t++) {
                    double tRad = Math.toRadians(t);
                    double length = 1.25;
                    double dx = Math.cos(tRad) * length;
                    double dz = Math.sin(tRad) * length;

                    Vector3f p = mat.transformPosition(new Vector3f((float) dx, 0, (float) dz));

                    Location particleLoc = playerLoc.clone().add(p.x, p.y, p.z);
                    if (ThreadLocalRandom.current().nextInt(2) == 0) {
                        if (t % 2 == 0) {
                            world.spawnParticle(Particle.FLAME, particleLoc, 1, 0f, 0f, 0f, 0f);
                            world.spawnParticle(Particle.REDSTONE, particleLoc, 1, dustOptions);
                        }
                    }
                }
            }
        }, this);
    }
}