Its really funny because Ive been trying to perfect a deck based around Kiln Fiend for the past few days. I totally love your ideas, I never even thought of bringing Blue to the table as a second color. Things that I have been toying with are Noxious Revival, in case you lose a fiend somehow. Apostles Blessing to make the fiend unblockable (like somone above said). Also Fling and Assault Strobe as kill cards. Care to elaborate anyone?
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You could try Shrine of Loyal Legions if your going for a sort of 1 card overrun strategy. Its real power comes out in a white deck but hey, it could still work here.
Mmmm, I'd ditch the Hexmages and try to grab another 2 Obliterators. Then maybe yeah.
Praetor's Grasp is always fun, Corrupt is always a good mono black choice, Contaminated Ground maybe? I love running a couple of those in my black control deck. As for creatures you could try Blind Zealot's. 3 Cost, but they may synergize with the Lashwrite nicely.
I like the idea, plus Lashwrithe is just incredible in any mono black deck. With only 14 creatures I'm assuming Sign in Blood is to be used on yourself, yeah? Anyways I like it. Gonna try this for myself.