Each comparison uses 1/3 ranks in the trait.Master of Shadows: Mastery increased by [ 650, 1300, 1950 ].
Murderous Intent: Your Versatility is increased by [ 1750, 3500, 5250 ] while Concordance of the Legionfall is active.
Shadowbind: Your spells and abilities have a chance to deal [ 166000, 332000, 498000 ] Shadow damage and heal you for [ 166000, 332000, 498000 ].
Chaotic Darkness: Your spells and abilities have a chance to deal 60000 to 300000 Shadow damage and heal you for 60000 to 300000. ( [ 60000, 120000, 180000 ] )
Torment the Weak: Your spells and abilities have a chance to cause Torment, dealing [ 19800, 39600, 59400 ] * 5 Shadow damage over 15 sec. This effect stacks up to 3 times.
Dark Sorrows: Your spells and abilities have a chance to afflict the target with Sorrow, causing it to burst after 8 sec, dealing [ 133100, 266200, 399300 ] Shadow damage.
Light Speed: Haste increased by [ 650, 1300, 1950 ]. Movement speed increased by [ 650, 1300, 1950 ].
Refractive Shell: Your spells and abilities have the chance to cause Refractive Shell, absorbing 200000 damage. Lasts 10 sec.
Shocklight: While Concordance of the Legionfall is active, your critical strike is increased by [ 1750, 3500, 5250 ].
Secure in the Light: Your harmful spells and abilities have the chance to deal [ 155000, 310000, 465000 ] additional damage and grant you Holy Bulwark, absorbing up to 77500 damage over 8 sec.
Infusion of Light: Your harmful spells and abilities have the chance to deal [ 116000, 232000, 348000 ] additional Holy damage. Your helpful spells and abilities have a chance to heal for 116000.
Light's Embrace: When you take damage, you have a chance to generate Light's Embrace, stacking up to 5 times. Light's Embrace heals for 29000 damage over 6 sec.
Updated with the buffed damage proc effects. Images from the post Norrinir made below.
From the results, even at this ilvl, it's pretty clear that the secondary stat effects are the best effects for all three specs. The damage effects seem to just be slightly undertuned, so until something changes there you would want to try and avoid those. There is also a pretty wide spread in effect value from the weakest to the strong - meaning that when you are choosing between a mid-tier and top-tier relic trait, the tree breakdown may end up being the deciding factor on if the relic is an upgrade or not.