CoA and Mara for what? with shockwave, 3k life, 75@, 10k+ def and if needed 100%+ leech with a quick hunger attack, you are nearly unkillable no matter what you face.
Get yourself some big extra damage in form of Guillaume face and Highlord, if you put a 15IAS jewel in guillaume you can even hit at 6fpa.
Also, for skills, if you get some shape shifting skillers you are more than good with just 1 point in lycanthropy and 1 point in werebear, that give you almost 40 free extra points in fireclaw synergies to get over 10k fire damage.
I don't have a proper Eth tomb reaver, so, this is with upped ribckracker (hit at 7fpa too), so my physical damage have less variance, but overall they have kinda the same averagem with the difference that you can go up to 6fpa with TR and you can't with ribcracker.
(garras fuego = fireclaw and destrozar = maul, that have the same damage than regular attack, that my physical damage) don't forget that you can also charge Maul to get more damage with your setup.
Also I have an infinity merc, instead or reaper merc, that is pure preference, both work, but might is better than defiance.