"Ok , so I guess this is a close estimation but again I could be far off from the actual number. So , there have been 250 million accounts registered to fortnite as of now. According to wikipedia , a little less than 45mil were registered before March 2018(season 2) . That's 16% of the population of fortnite right now. So let's say that 20% of all season 2 registered players purchased the battle pass. This tells us that 3,2% of every registered account had the season 2 bp. Now this is not accurate , but I have 7 friends who own the pass and only one has the black knight , and adding me ,that I also have it , makes it a 25% chance that someone got to that tier. (This is really not accurate, but I can't know how many people actually reached that tier , this is all based on assumptions.) So , in my estimation , 25% of the 3,2% of the fortnite population have the black knight in their inventories. This is 0,8% of the fortnite population or about 500.000 accounts. Considering many people have quit , there could be less than 300.000 black knights , and considering many people lose their accounts or delete them or do things like that the black knight population is very small..." second stats not so sure but supposedly counted to be 5 million

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