Warframe Saya's Visions

Koumei & The Five Fates came out and a new mission called Saya's Vision lets you farm Koumei, Amanta (Melee Weapon) and Higasa (Primary Weapon) blueprints!

Pretty much all you need to do is defend the Ostron Dwellings until Offerings are produce and deliver them to a Shrine. After 5 offerings an Infested Oni appears that you need to weaken until it becomes invulnerable. Follow up with 2 more offerings to make it vulnerable and kill it to complete the mission.

Pretty fun and rewarding!