RoR2 Custom Monster Spawner (bugged)

using System;
using UnityEngine;
using UnityEngine.Networking;
using System.Collections.Generic;

namespace RoR2
{
	public partial class CombatDirector : MonoBehaviour
	{
		public float timer = 0f;
		int monsterRating = 0;

		public Transform[] basicSpawner;
		public Transform[] flyerSpawner;
		public Transform[] crabSpawner;
		public Transform[] vagrantSpawner;
		public Transform[] bigSpawner;

		public string[] monsters;

		private void FixedUpdate()
		{
			// By emptying the CombatDirector we can handle monster spawns on our own.

			this.timer += Time.deltaTime;
			if(this.timer > 5f) // every 5 or so seconds we try to spawn something
			{
				this.timer = 0f;

				if(monsters == null)
				{
					this.basicSpawner = GameObject.Find("basic spawner").GetComponentsInChildren<Transform>();
					this.flyerSpawner = GameObject.Find("flyer spawner").GetComponentsInChildren<Transform>();
					this.crabSpawner = GameObject.Find("crab spawner").GetComponentsInChildren<Transform>();
					this.vagrantSpawner = GameObject.Find("vagrant spawner").GetComponentsInChildren<Transform>();
					this.bigSpawner = GameObject.Find("big spawner").GetComponentsInChildren<Transform>();

    				monsters = new string[]
					{
						"Beetle",
						"Jellyfish",
						"Wisp",
						"Lemurian",
						"Golem",
						"Bell",
						"HermitCrab",
						"GreaterWisp",
						"Vagrant",
						"BeetleQueen",
						"Titan"
					};

					monsterRating = 4; // start off only able to spawn the first 4 monsters
				}

				// Choose a random monster
				string monsterName = monsters[UnityEngine.Random.Range(0, monsterRating-1)];
				// Choose spawn location
    			Vector3 spawnPosition = Vector3.zero;
				if(monsterName == "Jellyfish" || monsterName == "Wisp" || monsterName == "GreaterWisp" || monsterName == "Bell")
				{
					spawnPosition = flyerSpawner[UnityEngine.Random.Range(0,flyerSpawner.Length)].position;
				}
				else if(monsterName == "HermitCrab")
				{
					spawnPosition = crabSpawner[UnityEngine.Random.Range(0,crabSpawner.Length)].position;
				}
				else if(monsterName == "Vagrant")
				{
					spawnPosition = vagrantSpawner[UnityEngine.Random.Range(0,vagrantSpawner.Length)].position;
				}
				else if(monsterName == "Vagrant")
				{
					spawnPosition = vagrantSpawner[UnityEngine.Random.Range(0,vagrantSpawner.Length)].position;
				}
				else if(monsterName == "BeetleQueen" || monsterName == "Titan")
				{
					spawnPosition = bigSpawner[UnityEngine.Random.Range(0,bigSpawner.Length)].position;
				}
				else
				{
					spawnPosition = basicSpawner[UnityEngine.Random.Range(0,basicSpawner.Length)].position;
				}

				GameObject prefab = MasterCatalog.FindMasterPrefab(monsterName + "Master");
				GameObject body = BodyCatalog.FindBodyPrefab(monsterName + "Body");

				GameObject monster = Instantiate<GameObject>(prefab, spawnPosition, Quaternion.identity);
				CharacterMaster master = monster.GetComponent<CharacterMaster>();
				NetworkServer.Spawn(monster);
				master.SpawnBody(body, spawnPosition, Quaternion.identity);
			}
		}
	}
}