The squaddies I use for this mission are always Miranda and Kasumi.
Anyway, I suppose you're stuck on the platforms. As the first collectors approach, position yourself in the cover in the middle of your platform, and send your squaddies to the covers at the front. Just as the enemy platform is about to latch on, focus your team's powers (warp and concussive shot in Miranda and Grunt's case) on a collector drone. It should probably get decimated in a second, but won't die, so you'll have to finish it with the Revenant (using Adrenaline Rush of course). Move onto the next drone and quickly kill him.
COMPLETELY IGNORE THE SCION!!! IT IS VITAL TO YOUR SUCCESS THAT YOU DO NOT TOUCH HIM UNTIL LATER!!!
If you time it right, Harbinger will possess the guardian a split second after you kill the second drone. Focus on him immediately, as a second platform will be on its way with more collectors when he's the only one left. As you finish him, a second scion will approach on a platform. IGNORE IT, and focus on the collectors. Kill them as quick as you can to prevent Harbinger from ADC.
Once you finish them, you'll only have the 2 scions. Now you can attack. Wither their health down to as low as you can without killing them, and then finish them off at the same time. If you just focused on one, a platform with more collectors would've come as soon as he was dead. This was you take care of both easily.
Pick off the last of the collectors at your leisure, but still be wary of Harbinger. You wouldn't want to start again after all the hard work! :P
It might take you 2-3 tries to get this technique perfectly. Hell, it took me about 10 tries to develop it, and then 3 to get it working! :P
If you're still stuck for help, PM me or visit my ME union, linked in the sig. :D
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