Each mission tier is pure survival. Keep taking out sentients and keep the Sentient Control meter below 100%. Last long enough to earn Phasic Cells and then head to Deimos to see Father, who’s got a list of new goodies for you.
You’ll want to purchase Lavos Blueprints first. He’s the new Warframe added with this event, and he’ll only be available until the event ends on January 18th. An alchemy-themed Warframe, Lavos lets you combine elemental damage to make his abilities even stronger and better-suited to whatever enemy Lavos is fighting.
Lavos’s shotgun, the Cedo, is also available from Father, as well as all the stuff you might have missed from the previous Scarlet Spear event, including the Ceti Lacera and Basmu blueprints. And if you’ve got a Necramech you’d like to spruce up, the new Nruntspar Skin will get rid of that skull-face in favor of something a little more robotic.
In order to access Operation: Orphix Venom you’ll need to have completed Heart of Deimos and The War Within quests. Keep in mind this is a limited-time-only event, so make sure you get everything you want from it before it’s gone on January 18. Console players will have to be patient for Operation: Orphix Venom to arrive later