Can't find Secondary Arcane Adapter in Market

Warframe - Primary And Secondary Arcanes warframe how to unlock weapon arcane slot complete the starchart to unlock the Steel Path go see Teshin in a relay (he's in the conclave, it can be fast warframe slot bundle Warframe > General Discussion > Topic Details As somebody who does every major update day 1 I forgotten what is EXACTLY necesary to unlock

warframe how to unlock weapon arcane slot You need to unlock Steel Path then defeat Acolytes to gather up Steel Essence trade it to Teshin for PrimarySecondary Arcane