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Assets/BattlemageVR/Resources/Scripts/DespawnAtLocation.cs

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+using UnityEngine;
+using System.Collections;
+
+public class DespawnAtLocation : MonoBehaviour
+{
+    public Vector3 TargetLocation = new Vector3(0, 0, 0);
+
+	// Update is called once per frame
+	void Update () {
+	    if((transform.position - TargetLocation).magnitude < .0001f)
+        {
+            Destroy(gameObject);
+        }
+	}
+}

Assets/BattlemageVR/Resources/Scripts/EnemyProjectileSpawnZone.cs

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+using UnityEngine;
+using System.Collections;
+
+public class EnemyProjectileSpawnZone : MonoBehaviour
+{
+    public float SpawnRateInSeconds = 1;
+
+    private float _lastSpawnTime = 0;
+
+	// Update is called once per frame
+	void Update () {
+	    if(Time.time - _lastSpawnTime > SpawnRateInSeconds)
+        {
+            _lastSpawnTime = Time.time;
+            SpawnRandomProjectile();
+        }
+	}
+
+    private void SpawnRandomProjectile()
+    {
+        var t = transform;
+        var extent = t.localScale / 2;
+        var topForwardRight = t.position + t.up * extent.y + t.right * extent.x + t.forward * extent.z;
+        var bottomBackLeft = t.position - t.up * extent.y - t.right * extent.x - t.forward * extent.z;
+        var randPosition = new Vector3(
+            RandRange(topForwardRight.x, bottomBackLeft.x),
+            RandRange(topForwardRight.y, bottomBackLeft.y),
+            RandRange(topForwardRight.z, bottomBackLeft.z));
+
+        var projectile = CreateProjectile(randPosition, new Vector3(0, 1, 0));
+        projectile.transform.SetParent(transform, true);
+    }
+
+    private static GameObject CreateProjectile(Vector3 position, Vector3 target)
+    {
+        var projectile = Instantiate(PrefabFactory.RedFireballPrefab);
+        projectile.transform.position = position;
+
+        var moveScript = projectile.AddComponent<MoveToLocation>();
+        moveScript.Speed = 1f;
+        moveScript.TargetPosition = target;
+
+        var despawnScript = projectile.AddComponent<DespawnAtLocation>();
+        despawnScript.TargetLocation = target;
+
+        return projectile;
+    }
+
+    private static float RandRange(float a, float b)
+    {
+        if(a < b)
+            return Random.Range(a, b);
+        return Random.Range(b, a);
+    }
+
+    // Draw the bounds of the spawn zone in edit mode
+    void OnDrawGizmos()
+    {
+        Gizmos.color = Color.yellow;
+        Gizmos.DrawWireCube(transform.position, transform.localScale);
+    }
+}

Assets/BattlemageVR/Resources/Scripts/MoveToLocation.cs

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+using UnityEngine;
+using System.Collections;
+
+public class MoveToLocation : MonoBehaviour {
+    public Vector3 TargetPosition = new Vector2();
+    public float Speed = 1;
+
+	// Update is called once per frame
+	void Update () {
+        var moveAmount = Speed * Time.deltaTime;
+        var direction = TargetPosition - transform.position;
+
+        if(moveAmount > direction.magnitude)
+        {
+            moveAmount = direction.magnitude;
+        }
+
+        transform.position += moveAmount * direction.normalized;
+	}
+}

Assets/BattlemageVR/Resources/Scripts/PrefabFactory.cs

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+using UnityEngine;
+using System.Collections;
+
+public static class PrefabFactory
+{
+    public static readonly GameObject RedFireballPrefab = (GameObject)Resources.Load("Prefabs/RedFireball");
+}