Racism

I dunno about Harkumen as a PC race. First, like 'Acupuncture' and named spells, it's world building, which we should wait on. Also, the whole 'immortal then loses skills' thing is unbalanced. The other races are all 'topologially' similar, meaning that their system implementation is all the same: stat minmaxing.

I say wait. I like having a set of optional races, but harkumen shouldn't be there yet. Make ogres optional too, as they get two +1s, which is qualitatively better than all the other races.

One idea is to have six 'core' races, with humans and one race each for each of the five stats:
Cambion, +1 CHA, -1 STR
Dwarf, +1 END, -1 AGIL
Elf, +1 IQ -1 END
Orc +1 STR, -1 IQ
Ratkin, +1 AGIL, -1 CHA

See how nice that is? None of this halfbreed shit.

Or, drop cambion for sidhe or some other CHA race, and make five or six GM optional races with +1s/-1s to two stats (e.g., ogres).