I got all my runes from drops. I would say Bac is my rarest, and I already got 9 of them. You can imagine the rest of my runes. I think Xol is quite common for me.
Undercity with Tribute of Harmony:
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That’s cheap man.
Great price
I have a few BAC but no XOL.
Does it drop from a specific boss or just random?
I got vex…i have a feeling that’s super rare like zod
hahaha Thank you for the validation! 
That was great. heh
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Took me a couple minutes - Look to trade runes in the trade channel. Many people are willing to trade for what you need.
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I finally got the BAC runes that I needed. They didn’t drop. I had to Reforge a bunch of Legendary runes to get them .
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I haven’t seen a single LAC and it’s only yellow!
Honestly, random upgrade, fine.
But we should be able to pick any three of one rarity to get a specific rune of the same rarity. Or something like that.
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Seems to be random. I keep running bosses and under city. Got one in Under city.
Oh yeah, i’ve done like 200 torm bosses since that comment.
Have plenty of runes now