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Appears to let Jacob and Esau share (gained?) stats, at least going forward. iirc, the pickup quote is "What's yours is mine" 06:56, 26 December 2016 (UTC)

It seems to give whichever brother picks it up 3 (Most recent?) items from the other broth. IE: I got Small Rock and 2 other items on both brothers. Didn't seem to have any effects after the initial item duplication. Azazel has no tagline when picking it up. The Lost gets "Better Destiny", but I'm not sure what changed, it's not a luck boost. -- 22:41, 26 December 2016 (UTC)

Picking up Birthright as The Lost ("Better Destiny") seems to change which items you get. Tested by using seed XQSWSMHX (hard) with lost and did the first floor with and without birthright (hacked it in on the first treasure room). I got different items (but some were the same). It seems like it has a chance to replace a pedestal item with a "better" one? I don't know how the game decides what a better item is though, maybe a hidden pool? Need some further testing. 23:40, 28 December 2016 (UTC)