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тьма кромешная stresses
gen.	black as night; black as hell; black as pitch; black as my hat; pitch dark; as dark as midnight; as dark as pitch; palpable darkness; pitch black (Andreyka); absolute darkness
Gruzovik	outer darkness
idiom.	as black as your hat (Bobrovska)
Makarov.	black as soot; inky darkness
obs.	outer darkness
proverb	as black as hell; black as hell hat
relig.	pitch darkness (Lena Nolte)
uncom.	dark as a pocket (joyand)

тьма кромешная: 12 phrases in 4 subjects

American usage, not spelling	1
General	7
Idiomatic	2
Makarov	2