Sykar
Arcane
Farming endo and credits for maximizing prime mods is a pita.
Just do it solo, it's mostly p. easy with stealth frames.
Loki is my guy!
When learning the spy missions (was learning the game as well ) I wanted to limit or not use stealth at all so i didn't get overly reliant on it and could do with all frames. There is an exception: the Kuva Fortress spy. Kuva spy seems like too much a pain in the ass to do with anything other than a stealth ability character.
I still do it at times - a matter of sloppy speed and not caring enough. Of course I know what mean though. Avoid pugging spy missions all together helps.
You can call it "I got B" , make your way through room, be working at the data console and some scummy ass will waltz into room at set off the alarm. In fact it's almost a guarantee. The fact that the team will see you on radar and name in hud as already working the room doesn't help.
I actually enjoyed (in a sick way) forcing myself to 'master' the Moon Spy mission and thought it the toughest... then the Kuva Fortress came along, such a ball breaker. There's probably paths I don't know about but so far its not worth the hassle to discover.
Been a good day for stocking up on Catalysts\Reactors.