It's random, but I've got a feeling it will be intellect for a few weeks then discipline after. Either way it's just another way of keeping people to grind for the perfect builds. It's clever. Am not bothered either way. I still run 100% on intellect and strength just mixed and match. Hopefully you will get what you want mate, just a matter of time for us all.
Good luck
English
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Nothing is random in Destiny. This was done on purpose, to slow down your progress. Artificially increase the difficulty. give you an illusion of more content, when there isn't much.