I think you'd get a wartan. Or a Titlock, depending on the dominant traits in the baby.
Edit: we shall name the baby wartan. Wartan the warlock Titan.
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The only thing I'm imagining is a Striker titan using his Fist of Havoc, but while he does his superman fly animation for "Death from Above", a Nova Bomb forms at his fist and when he hits the ground, he unleashes the power of the Nova Bomb and the Fist of Havoc all in one shot. Or he becomes the ultimate punchbro with Defender titan and Fireborn.