Talk:Extractor/@comment-79.103.105.207-20140206054557

Does Mastery Rank 15 give you +1 Extra Drone?

Since all previous once were unlocked every 5 ranks, at 5 then at 10 Does this means that?
 * Mastery 0–4: 1 drone
 * Mastery 5- 9: 2 drones
 * Mastery 10-14:  3 drones
 * Mastery 15-19:  4 drones ?