Use your unique Referral link to increase Tenno forces. A friend is considered a recruit once they have successfully completed 10 missions. The more Ninjas you recruit, the higher the reward. Go forth good Tenno — recruit and be rewarded! Recruit Ninjas and earn major rewards! Using your unique referral link, encourage your friends to play WARFRAME. For every five users you refer that complete 10 Warframe missions, you'll earn a new reward!