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Yhorian
This is defilement and black light, as well as certain spells such as evil demonfire, energy drain and vampiric touch.

I'm not certain "black light" is negative. It seems as if damage types always come in twos.

The two "negative" weapon types are "defilement" and "infernal power".

The two "positive" weapon types are "wrath" and "divine power".

The two "light" weapon types are "searing light" and "brilliant radiance".

Cold is "freezing bite" or "frigid chop".

Fire is "flaming bite" or "searing cut".

Not sure where "black light" falls. Magic maybe?