Board Thread:General Discussion/@comment-17054615-20150516215111/@comment-35430563-20180428184711

Spoiler-ish (but if you care enough, you have probably seen it by now! :) )

Soul stone - not Heimdell, not herb but 'hand'. That's the THANOS theory location.

Tbh, I'm glad it wasn't something we could easily guess as the hand in question belongs to a being in a previously unseen location. It would have been easy (and implausible) for another stone to be on Earth or with an Asgardian. The way it plays out is devastating brilliant.