"Dancing with the Beam Queen" is very true! Tough mission unless you spam Gauss Warthogs, then it's very doable!
My strategy for Mission 7: Scarab
The overall focus in order of importance:1. Spam Gauss Warthogs
2. Take out all the Power Nodes
3. Take out the Scarab!
4. Defend your base against frequent Covenant attacks
My general walkthrough steps:1. At the start, upgrade your Warthogs up to Gauss, delete the Vehicle Depot, and focus on getting supplies and Field Armory upgrades.
2. Spam Warthogs as soon as you have Gauss Warthogs.
3. Take the Scorpion, the two Rhino's, and your two infantry to the right. Try to take out the first Power Node, and possibly the 2nd Power Node on the right side before you lose those troops.
4. Build anti-vehicle Turrets on your base.
5. Spam Warthogs!
6. Once you have around 10-15 Warthogs, start going around the map destroying Power Nodes--watch out for the Scarab beam, and try to go the opposite direction it is going. If it sees you and turns red, you have a few seconds to get out of the way before being incinerated!
7. Take out all the Covenant and the Power Nodes, then go North to the Scarab with all your Warthogs.
8. Make sure your base is still constantly building Warthogs!
9. Park your Warthogs on one side of the Scarab, and whenever the beam starts getting close, run a Warthog through the beam in the other direction, and basically play tag with the beam. It will follow the Warthog for a bit, then go back. Drive into it again, and go back away from your Warthog army, and repeat!
10. Use the Mac Blast as often as you can on the Scarab.
11. It'll just take some time, but eventually your Warthogs will wipe it out quite smoothly.
12. Make sure to have some Warthogs at your base because the Covenant will send in quite a few ground attacks(including Hunters and Locust) as you chew through the Scarab.
13. Don't forgot to balance protecting your base and playing tag with the Scarab beam. If you don't pay attention, the Scarab can wipe out your entire army in a few seconds!
14. Victory!
