As someone who mostly plays solo, I got my first sleeper without having done the raid. The strike is pretty easy, the hardest was the escalation level clears. It's either luck, or getting people to help. Come week 2, if you can find a couple of people with decent power you can smash through the first wave three times quite easily.
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Get to the ogre with about 30 to 40 seconds left. So far for me unachievable