[10-2-21] 21. Aegus...Empyrrean's Guardian

The galactic gate is located in a large crater near the center of the map. You'll need to reach it and capture it to win.

The valley along the eastern side of the map is a prime spot to build your base. There seems to be only one main entrance into this valley, making it easier to defend. Consider setting up a Doomsday Machine or other heavy defenses here.

Head to the bottom-left of the map. You'll find several metal mines clustered together. Capturing these existing mines or destroying them and building your own will significantly boost your metal income. Protect this area well with a Doomsday Machine (after building a fusion reactor or two), some troops, and a Deleter.

The computer might use Erasers to cloak some of its units. Keep some fast units handy to help scout and find these hidden enemies.

You can build an Intimidator here. Just be super careful when you aim it; you don't want to accidentally blow up the galactic gate before you can capture it!

When you first send your tanks into the valley, make sure they're set to 'return-fire.' This prevents them from accidentally destroying the ARM construction unit down there. Let your tanks handle the Bulldog, Eraser, and laser tower first. Once they're down, the ARM construction unit is vulnerable. Bring your Commander down to capture it, giving you access to a full line of ARM structures.

A contributor mentioned a less obvious way into the valley, a bit below halfway down the map. It seems only the Commander can traverse this path due to the steep incline, though it's unclear if Kbots can make it. This might offer a flanking opportunity if you can utilize it.

For taking out buildings from a distance, use Diplomats supported by an Informer and a Deleter. This allows for safe destruction of enemy structures.

If you're playing on a higher difficulty, you might encounter an Annihilator. Taking out the fusion reactor located in the same crater as the galactic gate could reduce its effectiveness.