Augmented Strength - (pet) raises melee damage but not cap damage (roughly 1 damage per 4, wasted points) Normal effect for shade
Augmented Dexterity - (pet) increases cast speed Normal effect for shade
Augmented Quickness - (pet) increases attack speed (48 is almost unnoticable, wasted points) Normal effect for shade
Augmented Constitution - (pet) increases hitpoints (wasted points, max Toughness first) Normal effect for shade
Mastery of Magery & Wild Power - Works on all necromancer spells. Strictly speaking it doesn't affect the pet but the abomination's melee proc is counted as the shade's spell and all other spells are also dependant upon the shade's acuity/crit chance. Magery increases cap damage
Augmented Acuity - identical to Mastery of Magery only at a pitiful rate of damage increase and cap damage is unaffected
Mastery of Pain - benefits both the shade and the pet, stacks with Wild Minion
Mastery of the Arcane - benefits both the shade and the pet. Due to the shade only using ACU/DEX and the pet only having access to STR/DEX/DEX-QUI/STR-CON it's not worth having. The ABS buff isn't affected nor the DS. If you do pick this up for the purpose of pet bulk you'll want to find the breakpoints for your given spec (magic abs has seperate breakpoints from melee)
Mastery of the Art - benefits both the shade and the pet