init

src/main/java/pl/piecuu/invisninja/InvisNinja.java

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+package pl.piecuu.invisninja;
+
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.PlayerDeathEvent;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.bukkit.potion.PotionEffectType;
+
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.TextReplacementConfig;
+import net.kyori.adventure.text.format.TextDecoration;
+
+public class InvisNinja extends JavaPlugin implements Listener {
+  @Override
+  public void onEnable() {
+    Bukkit.getPluginManager().registerEvents(this, this);
+  }
+
+  @EventHandler
+  public void onPlayerDeath(PlayerDeathEvent e) {
+    Entity en = e.getDamageSource().getCausingEntity();
+    if(!(en instanceof Player p)) return;
+    if(!isPlayerInvisible(p)) return;
+
+    Component newMessage = e.deathMessage()
+      .replaceText(TextReplacementConfig.builder()
+        .match(p.getName())
+        .replacement(Component.text("aaaaaaaaaaaaa").decoration(TextDecoration.OBFUSCATED, true))
+        .build()
+      );
+    e.deathMessage(newMessage);
+  }
+
+  public static boolean isPlayerInvisible(Player p) {
+    return p.hasPotionEffect(PotionEffectType.INVISIBILITY);
+  }
+}

src/main/resources/plugin.yml

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+name: invisninja
+version: 1.0
+author: Piecuu
+main: pl.piecuu.invisninja.InvisNinja
+api-version: '1.21.11'