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In this paper, we briefly present RELXILL_NK, the first and currently onlyreadily available model of the relativistic reflection spectrum of black holeaccretion disks that includes non-Kerr solutions for the black hole spacetime,thus allowing for tests of the Kerr hypothesis and GR. RELXILL_NK makes use ofa general relativistic ray-tracing code to calculate the relativistic effectsof any well-behaved, stationary, axisymmetric, and asymptotically flat blackhole spacetime, while the disk physics is handled through the non-relativisticX-ray reflection code XILLVER. A number of different flavors are availablewithin RELXILL_NK; we summarize and compare these flavors using the Johannsenmetric for the black hole spacetime.

RELXILL_NK: A Black Hole Relativistic Reflection Model for Testing General Relativity