Just seen this post on reddit -
One of the comments points out the obvious that if this mastery is shield-based, Oathbreaker + Soldier is indeed going to be disgusting.
Really looking forward to seeing, though.
Though Zantai still pretends to know nothing it was pretty much confirmed in the last stream.
http://www.grimdawn.com/forums/showthread.php?t=77182
And was hinted at right back in March when Grava “leaked” the Sentinel as a class.
And it’s Oathkeeper.