This is Where you Start The Glast Gambit [GETTING NIDUS]

[Lynoid]

Since everyone is asking this, so I might just tell you all here.
Go to a relay and go to Perrin syndicate, talk to Ergo Glast.

[[DE]Taylor]

(you need to have finished The War Within to unlock it, as an FYI!)

[Lynoid]

there's a bug after finishing the spy quest, you'll need to check your inbox once more (or relog) to fix it.
(no it's not because of us skipping transmission)

FYI since too much ppl asking at region, from the quest you'll get only bp.. you'll need to get the component bp from purify mission on Eris:Oestrus.
-- If Oestrus is not showing up, you'll need to relog. --