I had 46 motes, bought one exotic engram and it was for Titan class. Kept it in my inventory and went back and bought last engram and lo and behold it was Heart of Praxic Fire. I pee'd a little. Very very stoked. Have all but one or two exotic armor for Warlock class and now waiting to spend 40 coins on Last Word and Ghalajorn if it's ever sold again.