Diablo 3 Mod Update Barbarian Mastery (2.7)
This Mod adds the Barbarian class to Grimer Mod Diablo 3 Classes (version 2.6 Update 3)
Requires Forgotten Gods

New Class : Barbarian
The Barbarian Mastery use most of the iconic Barbarian skills : 
Whirlwind, Earthquake, Furious charge, Leap, Call of The Ancients, War Cry, Avalanche, Ignore Pain, Seismic Slam, Ground Stomp, Weapon Throw
New Items
Rings :
Band of Might
Skull Grasp
Necklace :
Hellfire amulet
Rackoff Glass of Life
Medal :
Adria Medal
Belts :
pride of Cassius
Kyoshiro Souls
Feet :
Lut Socks
Gloves :
Tasker and Theo
Axe :
Fjord Cutter
Sankis
2 handed swordBlade of the Tribes
Shields :
Frydehr
Swords :
In Geom
Thunderfury
El Druin, sword of Justice
Shoulders:
Fury of the Ancients
Kanai Cube 
Lut Socks
Pride Cassius
Sets :
Immortal King
Might of Earth
Raekor
Wrath of the Wastes
New Cosmetic Items :
Tragoul Wings
Angelic Wings
Crusader : 23 new 2 handed melee weapons from Forgotten Gods available as 1 handed.
New Monsters
The new Boss monsters will only appear on shards above 60
Diablo with all 3 forms
His attacks include :
Diablo Form 1 :
Launches a series of two firebolt nova on a 360° radius.
Firebreath
An AoE dealing Fire and chaos damage
Summons black corrupted ares on the ground, they have a 2,5s delay after which any character standing on it will be trapped in a bone prison disrupting skills, reducing defenses and offense.
The most dangerous skills : Jump in the Air, becoming invulnerable for the duration of the skill.Diablo will launch multiples Meteor dropping from the sky slowly.Each meteor hitting will restores him 5% life.
You must avoid them.
Diablo Form 2 (Shadow) :
Firebreath is replaced by a Fire and Lightning breath.
Teleport movement skill
Summon Shadow warriors.
Diablo Form 3:
The Fire and Lightning Breath is replaced by a breath launching very slow moving bolts doing Fire, Chaos, Vitality, Mana burn damage, that also remove any buff on the player, disrupt skills, reduce resistance.
The long starting animation and very slow speed of the bolts allows you to avoid them completely.
Reward : Drop a Hellfire amulet with a random amulet prefix and a random suffix giving a Diablo 3 skill modifier.
Tyrael
His attacks include:
Summon 4 bolts of magic that explode after 3s dealing cold and lightning damage, freezing and removing any buff in a medium area.They also start dealing lightning damage with tether strike around them whild they are alive.You can avoid the explosions.
Launches El Druin, sword of justice from the Sky in a 4m radius for 5s.Each Sword hitting you will heal Tyrael with 1% Life.There is a delay before the Swords start dropping where you will see rays of lights in the area where the sword will drop, warning you to move away.
Summon El Druin put in the ground, the sword will cast a sphere of Light buff around it giving invulnerability to any other creature in it and doing slow lightning damage and Mana burn.
Either move away from this area or destroy ElDruin to remove the invulnerability buff.
Heal Skill with a 45s delay
Shadow strike
A special skill where tyrael put his sword in the ground becoming invulnerable during the animation.He will first cast a Judgement skill (AoE damage and stun for 0,7s).Then after a small delay he will cast a series of Judgement skills.
You need to move away after the first Judgement skill otherwise each AoE will stun you and you will be hit by the next until the end of the skills.This requires having around 45% stun resistance or being out of reach.
Reward : drop El'Druin, Sword of Justice focused on healing and a random suffix converting one type of damage to either cold or lightning
Adria
Summon blood magots and Aoe vitality and chaos damage.
Reward :drop a medal with a random prefix giving an augment to any class skill (more likely to be a Diablo class skill) and a suffix converting one type of damage to either chaos or vitality
Cow King
Summons Arcane orb with laser beam (like the Diablo 3 arcane enchanted affix with a 1.5s delay), frost bomb exploding after a 2.5s delay, small cow pet.
His wave attack can stun you for 4-5s
His most dangerous skill has a long cast animation to allow you to run away.The cow king will raise his weapon to the sky gathering fire, and then cast a series of fire bolts around him.
Reward : Can drop a rare material or a random legendary Diablo item.
CREDITS
Grimer for the Diablo 3 Classes Mod
Poibuts for giving me permission to use the Barbarian background class image : https://www.deviantart.com/poibuts/art/Diablo-III-Reaper-of-Souls-Barbarian-439878993
Howietzer for giving me permission to use the Barbarian class selection  image
https://www.deviantart.com/howietzer/art/I-Barbarian-436698184
Blizzard Entertainment for the Diablo 3 model assets
Crate Entertainment for Grim Dawn
Special thanks to all modders who helped me and gave advice : Asylum101, Ram, Elfe,Zak...