Initial commit

src/main/java/com/kasetoatz/fastGhast/FastGhast.java

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+package com.kasetoatz.fastGhast;
+
+import org.bukkit.attribute.Attribute;
+import org.bukkit.attribute.AttributeInstance;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.HappyGhast;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDismountEvent;
+import org.bukkit.event.entity.EntityMountEvent;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public final class FastGhast extends JavaPlugin implements Listener
+{
+    private static final double DEFAULT = 0.05;
+    private double SPEED;
+
+    @Override
+    public void onEnable()
+    {
+        saveDefaultConfig();
+        SPEED = getConfig().getDouble("speed");
+        getServer().getPluginManager().registerEvents(this, this);
+    }
+
+    private void setSpeed(Entity entity, double speed)
+    {
+        if (entity instanceof HappyGhast ghast)
+        {
+            AttributeInstance attr = ghast.getAttribute(Attribute.FLYING_SPEED);
+            if (attr != null)
+            {
+                attr.setBaseValue(speed);
+            }
+        }
+    }
+
+    @EventHandler
+    public void onEntityMount(EntityMountEvent event)
+    {
+        setSpeed(event.getMount(), SPEED);
+    }
+
+    @EventHandler
+    public void onEntityDismount(EntityDismountEvent event)
+    {
+        setSpeed(event.getDismounted(), DEFAULT);
+    }
+}

src/main/resources/config.yml

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+# Flying speed of mounted Happy Ghasts, default speed is 0.05 so 0.15 is 3 times as fast.
+speed: 0.15

src/main/resources/plugin.yml

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+name: FastGhast
+version: '1.0'
+main: com.kasetoatz.fastGhast.FastGhast
+api-version: '1.21'