The Auto Buff Gem

It's an NX pet equip that allows you to automatically buff yourself whenever the buff's expired. It will come in handy when using the buffs such as Combo Attack. The best class I can confirm are Crusader, DrK (Dragon Knight), and Priest.

Now here are the skills I confirm to work with the auto buff.

 Adventurers

Icon	Buff Name	Class	Does it work?
	Weapon Booster/Spell Booster	2nd Job: Warrior, Bowman, Thief, and Pirate / 3rd Job: Magician	Yes
	Maple Warrior	All 4th Job Adventurer classes	Yes
	Iron Body	1st Job Warrior and above	Yes
	Rage	Fighter and above	Yes
	Power Reflection/Power Guard	Fighter (Power Reflection) and Page (Power Guard) and above	No
	Iron Will	Spearman and above	Yes
	Hyper Body	Spearman and above	Yes
	Combo Attack	Crusader and above	Yes
	Flame Charge	Knight and above	Not Confirmed
	Blizzard Charge	Knight and above	Not Confirmed
	Thunder Charge	Knight and above	Not Confirmed
	Combat Orders	Knight and above	Yes
	Dragon Strength	Dragon Knight and above	Yes
	Stance	Hero, Paladin, and Dark Knight	Yes
	Enrage	Hero	Not Confirmed
	Divine Charge	Paladin	Not Confirmed
	Eye of the Beholder	Dark Knight	No
	Magic Guard	1st Job Magician and above	Yes
	Magic Armor	1st Job Magician and above	Yes
	Meditate	Wizard (Fire/Poison and Ice/Lightning) and above	Yes
	Invincible	Cleric and above	Yes
	Bless	Cleric and above	Yes
	Teleport Mastery	3rd Job and Above: Mage and Priest	No
	Holy Symbol	Priest and above	Yes
	Holy Magic Shield	Priest and Above	No
	Infinity	Arch Mage (Fire/Poison and Ice/Lightning) and Bishop	No
	Ifrit/Elquines	Arch Mage F/P (Ifrit) and Arch Mage I/L (Elquines)	No
	Advanced Bless	Bishop	Not Confirmed
	Bahamut	Bishop	No
	Soul Arrow	2nd Job Bowman and above	Yes
	Silver Hawk/Gold Eagle	Hunter and Wild Hunter (Silver Hawk) and Crossbow man (Gold Eagle) and above	No
	Concentrate	Ranger, and Sniper and above	Yes
	Phoenix/Frostprey	Ranger, and Sniper and above	No
	Sharp Eyes	Bow Master, and Crossbow Master	Yes
	Illusion Step	Bow Master, and Crossbow Master	Yes
	Dark Sight	1st Job Thief and above	Yes
	Haste	1st Job Thief	Yes
	Karma	Bandit and above	Not Confirmed
	Meso Guard	Bandit and above	Yes
	Shadow Partner	3rd Job Thief and above	Yes
	Dark Flare	3rd Job Thief and above	No
	Shadow Stars	Hermit and Above	Yes
	Pickpocket	Chief Bandit and above	Yes
	Mental Clarity	Infighter and above	Not Confirmed
	Infinite Bullets	Gunslinger and above	Not Confirmed
	Lucky Dice	Buccaneer and Valkyrie and above	No
	Willow Defense	Buccaneer and above	Not Confirmed
	Hollow Point Bullets	Valkyrie and above	Not Confirmed
	Wind Booster	Viper	Yes
	Time Leap	Viper	No

 Knights of Cygnus

Icon	Buff Name	Class	Does it work?
	Weapon Booster/Spell Booster	All Cygnus classes 2nd Rank and above	Yes
	Final Attack	Soul Master and Wind Breaker 2nd Rank and above	Not confirmed
	Soul	Soul Master 1st Rank and above	No
	Iron Body	Soul Master 1st Rank and above	Yes
	Rage	Soul Master 2nd Rank and above	Yes
	Power Reflection	Soul Master 2nd Rank and above	No
	Combo Attack	Soul Master 3rd Rank	Yes
	Soul Charge	Soul Master 3rd Rank	Not Confirmed
	Flame	Flame Wizard 1st Rank and above	No
	Magic Guard	Flame Wizard 1st Rank and above	Yes
	Magic Armor	Flame Wizard 1st Rank and above	Yes
	Meditate	Flame Wizard 2nd Rank and above	Yes
	Teleport Mastery	Flame Wizard 3rd Rank	No
	Ifrit	Flame Wizard 3rd Rank	No
	Storm	Wind Breaker 1st Rank and above	No
	Soul Arrow	Wind Breaker 2nd Rank and above	Yes
	Concentration	Wind Breaker 3rd Rank	Yes
	Darkness	Night Walker 1st Rank and above	No
	Haste	Night Walker 1st Rank and above	Yes
	Shadow Partner	Night Walker 3rd Rank	Yes
	Shadow Stars	Night Walker 3rd Rank	Not Confirmed
	Lightning	Striker 1st Rank and above	No
	Mental Clarity	Striker 2nd Rank and above	Not Confirmed
	Wind Booster	Striker 3rd Rank	Yes

 Resistance

Icon	Buff Name	Class	Does it work?
	Weapon Booster	Wild Hunter and Demon Slayer 1st Rank and above, Battle Mage and Mechanic 2nd Rank and Above	Yes
	Maple Warrior	All Resistance Classes 4th Rank	Yes
	Dark Aura	Battle Mage 1st Rank and above	No
	Yellow Aura	Battle Mage 2nd Rank and above	No
	Blood Drain	Battle Mage 2nd Rank and above	Not Confirmed
	Blue Aura	Battle Mage 3rd Rank and above	No
	Teleport Mastery	Battle Mage 3rd Rank and above	No
	Stance	Battle Mage 3rd Rank and above	Yes
	Soul Arrow	Wild Hunter 2nd Rank and above	Yes
	Silver Hawk	Wild Hunter 3rd Rank and above	No
	Sharp Eyes	Wild Hunter 3rd Rank and above	Yes
	Open Portal: G-X9	Mechanic 2nd Rank and above	No
	Satelite	Mechanic 3rd Rank and above	No
	Rock 'n Shock	Mechanic 3rd Rank and above	No
	Healing Robot H-LX	Mechanic 3rd Rank and above	No
	Acceleration Bot EX-7	Mechanic 3rd Rank and above	No
	Lucky Dice	Mechanic 3rd Rank and above	No
	Dark Revenge	Demon Slayer 2nd Rank and above	No
	Dark Endure	Demon Slayer 3rd Rank and above	Yes
	Metamorphosis	Demon Slayer 4th Rank	No
	Vampiric Touch	Demon Slayer 4th Rank	Yes

 Legend

Icon	Buff Name	Class	Does it work?
	Weapon Booster/Magic Booster	All classes except Aran and Evan 2nd Rank and above, Aran 1st Rank and above, and Evan 6th Growth	Yes
	Maple Warrior	All classes except Evan and Dual Blade 4th Rank, Evan 9th Growth (Lv.: 120+) and above, and Dual Blade 6th Rank (Dual Master/Blade Master)	Yes
	Body Pressure	Aran 2nd Rank and above	No
	Combo Drain	Aran 2nd Rank and above	No
	Snow Charge	Aran 2nd Rank and above	Not Confirmed
	Might	Aran 3rd Rank and above	Not Confirmed
	Combo Recharge	Aran 3rd Rank and above	No
	Maha's Blessing	Aran 3rd Rank and above	Yes
	Freeze Standing	Aran 4th Rank and above	Yes
	Combo Barrier	Aran 4th Rank and above	No
	Magic Guard	Evan 3rd Growth (Lv. 30+)	Yes
	Magic Shield	Evan 5th Growth (Lv. 50+)	Not Confirmed
	Magic Resistance	Evan 7th Growth (Lv. 80+)	Not Confirmed
	Onyx's Protection	Evan 8th Growth (Lv. 100+)	Not Confirmed
	Teleport Mastery	Evan 8th Growth (Lv. 100+)	No
	Illusion	Evan 9th Growth (Lv. 120+)	Not Confirmed
	Blessing of the Onyx	Evan Final Growth (Lv. 160+)	Not Confirmed
	Soul Stone	Evan Final Growth (Lv. 160+)	No
	Onyx's Will	Evan Final Growth (Lv. 160+)	Not Confirmed
	Soul Infusion	Mercedes 2nd Rank and above	Not Confirmed
	Ignis Lore	Mercedes 3rd Rank and above	Not Confirmed
	Water Shield	Mercedes 3rd Rank and above	Not Confirmed
	Elemental Knight	Mercedes 3rd Rank and above	No
	Ancient Spirit	Mercedes 4th Rank	Not Confirmed
	Dark Sight	Dual Blade 1st Rank and above	Yes
	Self Haste	Dual Blade 1st Rank and above	Yes
	Karma	Dual Blade 3rd Rank and above (Dualer/Blade Acolyte)	Yes
	Mirror Image	Dual Blade 5th Rank and above (Slasher/Blade Lord)	Yes
	Mirrored Target	Dual Blade 6th Rank (Dual Master/Blade Master)	Not Confirmed
	Thorns	Dual Blade 6th Rank (Dual Master/Blade Master)	Yes
	Moonlight	Phantom 3rd Rank	Not Confirmed
	Aria's Prayer	Phantom 4th Rank	Not Confirmed
	Monkey Magic	Cannon Shooter 2nd Rank	Yes
	Lucky Dice	Cannon Shooter 3rd Rank	No
	Pirate Spirit	Cannon Shooter 4th Rank	Not Confirmed
	Hyper Monkey Spell	Cannon Shooter 4th Rank	Not Confirmed

 Non-KMS Classes

Icon	Buff Name	Class	Does it work?
	Weapon Booster	Dragon Warrior 2nd Rank and above	Yes
	Maple Warrior	Dragon Warrior 4th Rank and above	Yes
	Mental Clarity	Dragon Warrior 2nd Rank and above	Not Confirmed
	Lucky Dice	Dragon Warrior 3rd Rank and Above	No

= not confirmed

Note: Auto Buff Gem doesn't work with potential skills such as Decent Hyper Body and Decent Sharp Eyes.

As for Party Skills, the pet only buffs when the skill expires, so if the person you're going to buff is out of range, the person doesn't get the buff and won't if the buff is in effect. Which means you have to go towards the person that didn't get buffed and right click on the skill to rebuff so that he/she gets the buff.

I'll add in more buff skills if anyone could confirm the skills for Hero, DarK, Bishop, and any other classes. That would be greatly appreciated.

For those of you wondering why I'm using different names, I'm used to the original KMS names or I'm not always used to GMS names.

For Dual Blade and Cannoneer skills, please check the Legends skill list, that'll help you.

Credit goes to [MENTION=9606]Pink Bean[/MENTION] and [MENTION=6037]Dark Link[/MENTION] for confirmation on other skills.