What if a wormhole made a connection that led somewhere other then W-space?

Shepard overcomes indoctrination and fires the catalyst, disabling the Reapers. An unintended side effect of the catalyst causes Haestrom's sun to oddly generate a stable wormhole to universe filled will cybernetic lifeforms more terrible then Reapers, Capsuleers.

Shepard attempts to rally the various races to come together and fight off the reapers. As he goes through a wormhole running away from Cerberus, he stumbles across an entire new civilization, with an armada that blocks out the stars.