how i can unlock arcane slot ? i dont have in this

how i can unlock arcane slot ? i dont have in this warframe how to unlock weapon arcane slot Because 15 essence per weapon isn't a lot to begin with and you only need the slot for warframe slot bundle If you go to your marketplace and you search for war frame slots, you can see here that you can purchase a slot for 20 Platinum right there But if you don't

warframe slot bundle I like to collect weapons too I am struggling to figure out why it actually matters what has the arcane slot unlocked Does not having the slot

warframe how to unlock weapon arcane slot As an example, having an Exilus slot on all melee weapons , would say be a great spot to Warframe > General Discussion > Topic Details As somebody who does every major update day 1 I forgotten what is EXACTLY necesary to unlock