From what step are Primary Arcane Adapters

Arcane Dissolution & what DE won't tell you! Warframe Warframe

Just as Jack Devine said, warframe slots decide how many warframes you can own at a time Your start off with two slots and can buy more with

warframe slot bundle arcane works in Warframe with the hope of clearing-up as many questions as possible

warframe complete starter 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