What if Zrot became more of a zoning tool?

So first here are a few observations.

Current Zzrot is only good if you are ahead. It (intentionally) is not good at clearing waves or defending towers. THe range prohibits it from taking towers while being in 'safe' far away. When ahead there are better items to take to help snowball taking towers. Tiamat and Sheen items come to mind for faster pushing power, dueling power, and tower smashing power.

So.

What if Zrot portal was slightly...different? Give it more play around other objectives and a small amount of teamfight presence.

UNIQUE Active: Spawns a Void Gate for 150 seconds (150 second cooldown).

Every 2 seconds the gate makes a Voidspawn. Voidspawn hunt and kill nearby enemies. Voidspawn do not leave an area around the void gate. Voidspawn can attack structures. If there are no enemies present voidspawn will roost within the gate. Up to (championlevel/3) will roost at a time.