WarframeAlchemyLab ES
How to farm it? See the full plan Part of: Kroostra

Where it drops

Saturn / Variant Team Annihilation Conclave Rot. C 3.57%

FAQ

Where does Kroostra Blueprint drop?

The best source of Kroostra Blueprint is Variant Team Annihilation (Saturn), at 3.57% per reward according to Digital Extremes' official drop tables.

Can Kroostra Blueprint be traded?

No, Kroostra Blueprint cannot be traded: you have to earn it in-game.