Decided to test this out since I finally got Darkness Sorcery maxed and I haven't seen anyone try.
Looks like the 100% Elemental Resistance ignore on the skill works on Physical Resistance as well. Other than that 100% ER Ignore, the skill gives 40% defense ignore, but I would doubt that alone will increase my damage 3x. There's also a difference of 1 orb on Blessing of Darkness in the screenshots below but it still wouldn't add this much.
Range is ~17.5k in the screenshots below using level 11 Light Reflection
without level 30 Darkness Sorcery
with level 30 Darkness Sorcery
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