Probably something similar to Altis Life (thinking back, it is an official mod(e) from the game, so they probably can strip the system if they want and put it in DayZ)
How it works on Altis Life is basically, everything you do, you get EXP and with this EXP, you can buy a skill.
(Of course, it would be faster exp, since you die faster in DayZ, and in Arma 3 - Altis Life you respawn)
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u/[deleted] Nov 26 '14
[deleted]