I've done quite a few strikes with alot of people not using the weekly element singe for their subclass, I guess its because its they're favorite or its the optimal for the strike?
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As a nightstalker main (top tree) its hard for me to think of a mission or strike where tether with rig isn't super beneficial to the team by eliminating a slew of adds [i]and[/i] feed the team with a ton of orbs at the same time. The weapons I use are of the element singe but tether is just too good to not use regardless.