I have it on my Titan, and yes you only get it by opening rare/blue class item engrams on a level 10 or less Titan
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That's awesome! Do you know how many engrams it took you to get it?
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Edited by Watch9: 7/12/2015 6:18:42 PMIt took me one engram, but I think there are two other "special" Titan marks like this one