I chose Memory of Timur to get me some alien friends.
Why is it dangerous? The effect ends after 30 seconds. Better keep that in mind or you might end up getting shot in the back and killed in heroic strikes, nightfalls etc.
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Timurs is cool and it doesn't limit you to one at a time. Doing the last gally mission on defender titan I had like 4 helpers at one point lol. I also play pve pretty much exclusively