Besides high level endless missions (Survival, Defense, etc) the best way to level up your Warframe is
● Sanctuary Onslaught
Bring at least one good weapon so you are still some use to your squad.
The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.