The Ropalolyst Assassination mission added in the jovian concord update to Warframe is just like eidolon hunting to a degree. Grab your sniper rifle and you best amp to take down the Ropalolyst. Ropalolyst has limbs you need to shoot just like the regular eidolons but you need to crash the Ropalolyst first. Amalgam mods drop from the Ropalolyst mission and they seem to be like riven mods because they affect one weapon just like rivens.
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Outro music: Creative Minds https://www.bensound.co