For Thanksgiving, ChAIR is offering free Turkey Helms in Infinity Blade III that grant Isa and Siris an experience and skill-point boost. That's all well and good, but I don't think I'd be able to play through the game with the item equipped, as evidenced by that horrific image up there. Animal heads on human bodies (and vice versa) creep me out too much.
That said, the original Infinity Blade is also free right now. Do give that a download. It's one of my favorite iOS games to this day and with promos like this there's really no reason not to have it.
Go Cold Turkey in Infinity Blade III [Infinity Blade]