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December 24, 2014
Warframe - Mastery Rank 17 Promotion
In order to be promoted to the next mastery rank, Tenno must pass a test which differs from rank to rank with difficulty, increasing with Mastery Rank. If the test is failed you will not be able to try again for 24 hours.
You need to kill 35 enemies (Infested) and hit Orbs with melee in order to get more time
I suggest picking fast frames and good weapons with Puncture and Slash damage