Boss Help

Hey, I'm new to pocketmine.
How would i make it so villagers attack back and have a good reach and make it look like aim aura and also change the size
Please send a code
thanks!

 

PHP:

<?php

namespace Johanna;
use pocketmine\event\Listener;
use pocketmine\plugin\PluginBase;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\nbt\tag\DoubleTag;
use pocketmine\nbt\tag\FloatTag;
use pocketmine\nbt\tag\ListTag;
use pocketmine\Player;
use pocketmine\event\entity\EntityDamageEvent;
use pocketmine\entity\Entity;
use pocketmine\event\entity\EntityDamageByEntityEvent;
use pocketmine\event\entity\EntityDeathEvent;
use pocketmine\scheduler\Task;
use pocketmine\level\Level;
use pocketmine\level\Position;
use pocketmine\item\Item;
use pocketmine\utils\Config;
use pocketmine\command\CommandSender;
use pocketmine\command\Command;
use pocketmine\command\PluginCommand;
class Main extends PluginBase implements Listener {
    public function onEnable() : void{
        @mkdir ($this->getDataFolder());
        $this->c = new Config($this->getDataFolder() . "Config.yml", Config::YAML, [
            "maxhealth" => "30000",
            "maxscale" => "6",
        ]);
        $this->db = $this->c->getAll();
        $this->getServer()->getPluginManager()->registerEvents($this, $this);
        if (! $this->getServer()->isLevelGenerated("Boss")) {
            $this->getServer()->generateLevel("Boss", null, "FLAT");
        }
        if (! $this->getServer()->isLevelLoaded("Boss")) {
            $this->getServer()->loadLevel("Boss");
        }
        $this->cmd = new PluginCommand("boss", $this);
        $this->cmd->setDescription("boss Command");
        $this->getServer()->getCommandMap()->register("Boss", $this->cmd);
        $this->getScheduler()->scheduleDelayedTask(new class ($this) extends Task {
            private $owner;
          
            public function __construct(Main $owner) {
                $this->owner = $owner;
            }
            public function getOwner() {
                return $this->owner;
            }
            public function onRun(int $currentTick) {
                $nbt = new CompoundTag('', [
                    'Pos' => new ListTag('Pos', [
                        new DoubleTag('', 1),
                        new DoubleTag('', 75),
                        new DoubleTag('', 1)
                    ]),
                    'Motion' => new ListTag('Motion', [
                        new DoubleTag('', 0),
                        new DoubleTag('', 0),
                        new DoubleTag('', 0)
                    ]),
                    'Rotation' => new ListTag('Rotation', [
                        new FloatTag('', lcg_value() * 360),
                        new FloatTag('', 0)
                    ]),
                ]);
                $entity = Entity::createEntity(Entity::ZOMBIE, $this->owner->getServer()->getLevelByName("Boss"), $nbt);
                $entity->setMaxHealth(100);
                $entity->setHealth(100);
                $entity->setScale(10);
                $entity->spawnToAll();
                $this->owner->getServer()->broadcastMessage ("§f[§dElixir§fPvP] §c A Boss Has Spawned!");
            }
        }, 20);
    }
    public function onDeath(EntityDeathEvent $event) {
        $entity = $event->getEntity();
        if ($entity instanceof \pocketmine\entity\hostile\Zombie) {
            $nbt = new CompoundTag('', [
                'Pos' => new ListTag('Pos', [
                    new DoubleTag('', 253),
                    new DoubleTag('', 4),
                    new DoubleTag('', 253)
                ]),
                'Motion' => new ListTag('Motion', [
                    new DoubleTag('', 0),
                    new DoubleTag('', 0),
                    new DoubleTag('', 0)
                ]),
                'Rotation' => new ListTag('Rotation', [
                    new FloatTag('', lcg_value() * 360),
                    new FloatTag('', 0)
                ]),
            ]);
            $entity = Entity::createEntity(Entity::ZOMBIE, $this->getServer()->getLevelByName("Boss"), $nbt);
            $entity->setMaxHealth($this->db["maxhealth"]);
            $entity->setHealth($this->db["maxhealth"]);
            $entity->setScale($this->db["maxscale"]);
            $entity->spawnToAll();
            $this->getServer()->broadcastMessage ("§f[§dElixir§fPvP] §c A Boss Has Spawned!");
        }
    }
    public function onCommand(CommandSender $sender, Command $command, string $label, array $args) : bool{
        if ($command->getName() === "Boss") {
            if (! isset ($args[0])) {
                $sender->sendMessage("/ Boss Stamina <Health> \ n / Boss Size <Size>");
                return true;
            }
            if ($args[0] === "Boss Stamina") {
                if (! isset ($args[1]) or ! is_numeric($args[1])) {
                    $sender->sendMessage("Please enter numbers");
                    return true;
                }
                $this->db["maxhealth"] = $args[1];
                $sender->sendMessage($args[1] . " As the Boss Health");
                $this->save();
            }
            if ($args[0] === "size") {
                if (! isset ($args[1]) or ! is_numeric($args[1])) {
                    $sender->sendMessage("Please enter numbers");
                    return true;
                }
                $this->db["maxscale"] = $args[1];
                $sender->sendMessage($args[1] . " Is set to default size");
                $this->save();
            }
        }
    }
    public function onDisable() : void{
        $this->save();
    }
    public function save() {
        $this->c->setAll($this->db);
        $this->c->save();
    }
}


Here is my code can you show me how to make it attack make it hit faster or do more damage etc