For me, it's easy.
Because BDO is so heavily grounded in the RNG system, that even the RNG mechanic has RNG in it. I've never witnessed so much RNG in my entire MMO career. In fact, there's so much RNG in this game that it spilled over into the Customer Service Dept. because apparently, you need a lot of Luck and $$$ invested in the CSR node just to increase your RNG for getting a response.