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Nothing special to note, very minimal damage.

Appearance: Appears as a blue/white trail of sparkes, looks very similar to Energy Bolt on EC.

Debuffs the target's Dexterity stat based on the pet's Evaluate Intelligence skill.

Appearance: Clumsy appears as a spiral of purple over the target.

Debuffs the target's Intelligence stat based on the pet's Evaluate Intelligence skill.

Appearance: Feeblemind appears as a burst of yellow/orange sparkles over the target.

Debuffs the target's Strength stat based on the pet's Evaluate Intelligence skill.

Appearance: Weaken appears as a group of purple sparkles over the target.

Nothing special to note, minimal damage with a damage increase the closer your pet is to the target.

Appearance: Appears as a red circle around the target, with a blue starburst in the center.

Magery Mastery pets have bugged AI with Agility, they will only buff their target and not themselves.

Appearance: Appears as a spiraling blue/white effect over the target.

Magery Mastery may or may not cast Cunning. They cast all other stat buffs, but in my testing I have not seen them cast Cunning. If they do, it will most likely be bugged like the other beneficial buffs.

Appearance: Appears as a spiraling blue/white effect over the target.

Magery Mastery pets have bugged AI with Strength, they will only buff their target and not themselves.

Appearance: Appears as a multicolored sparkles over the target.

Magery Mastery pets have bugged AI with Bless, they will only buff their target and not themselves.

Appearance: Bless appears as blue orbs/sparkles around the target.

Magery Mastery pets may not cast Fireball. The spell should technically be in the pet's rotation, but I have yet to see it cast an actual Fireball in my testing.

Appearance: Fireball appears as a ball of fire that flies from your pet to your target.

Magery Mastery pets will cast the Poison spell on their targets. The Poison skill does affect the potency of the Poison, if your pet has innate Poisoning, or you trained Poisoning first, then switched to Magery Mastery.

Appearance: Poison appears as a green cloud over your target.

Arch Cure appears to be extremely bugged with the Magery Mastery AI. If the pet is poisoned, it will repeatedly attempt to Arch Cure its target and not itself.

Appearance:  Arch Cure appears as a swirling line of green spiraling around your target.

Magery Mastery pets will only cast Greater Heal on themselves, but at an extremely low priority. I would not rely on the pet to heal itself at all.

Appearance: Greater Heal appears as a swirling blue/white light that spirals around your pet.

Magery Mastery pets will cast curse on their target, which can be quite potent.

Appearance: Curse appears as several light green orbs that swirl around the target.

Nothing special to note, minimal damage.

Appearance: Lightning appears as a lightning bolt over your target.

Magery Mastery pets will cast Magic Reflection on themselves. Magic Reflection will apply the following on the pet:

-20 Physical Resist
+10 Fire Resist
+10 Cold Resist
+10 Poison Resist
+10 Energy Resist

Some view this as a negative, but it can actually be beneficial on the right encounters. With Consume Damage, you don't always need extremely high physical resistance on your pet since Consume is powered by physical damage. Depending on your pet's other resists, this can give you up to 90 in the other 4 resists.

You can also mount your pet to remove this effect, but they will most likely cast it on themselves again.

Appearance: Magic Reflection appears as a yellow circle over your pet.

Magery Mastery pets will cast Paralyze, though it is often resisted due to the high Resisting Spells of most bosses in the game.

Appearance: Appears as a pulsing blue circle over the target.

Magery Mastery pets will cast Energy Bolt at their target for moderate damage.

Appearance: Energy Bolt appears as a trail of white/blue sparkles that start at your pet and fly to the target.

Magery Mastery pets will cast Explosion on their target. The damage is slightly delayed after casting it, and it usually cast alongside Flamestrike as a combo.

Appearance: Explosion appears as a fiery burst from the target once it detonates.

Magery Mastery pets will cast Flamestrike on their target. Flamestrike is usually cast immediately after Explosion to create a spell combo. 

Appearance: Flamestrike appears as a pillar of fire over the target.

Magery Mastery pets will cast Mana Vampire on their target when they are running low on mana. It can be quite potent against low Resisting Spells.

Appearance: Mana Vampire appears as a black and blue cloud over your pet.

Magery Mastery pets will often teleport to targets that are aggressing them from a distance.

Pets will not Teleport to player targets (PvP) under normal circumstances, however there are some instances that this ability can trigger.

Appearance: No effect, other than your pet teleporting.

Magery Mastery pets will cast Death Ray upon their targets, and like a player, it will continuously channel until the pet is out of mana or interrupted.

Appearance: Death Ray appears as light red sparkles over your pet during every tick.