This Discussion Says what every Monster's Attacks and there Keybinds and other things too.

Nergigante:
Level 1: 15K HP
Left Click: Claw Swipe
Right Click: Head Slam
C: Wing Bash Charge
X: Dive Bomb (Requires Nergigante to be at 50% or less to use and can be directed)
Q: Fly up and SLAM (Can be used while flying)
R: Roar (Stuns)
Spacebar: Fly (The only monster currently to be able to Fly)
Passive Ability: Rage (The Lower the HP of Nergi: The more damage Nergi Deals)
Diet: Carnivore
Location: Carnivore Island on The Island and South West Wyvern Lair in Ragnarok

Monster Matchup by Papa Gabe video




Glavenus:
Level 1: 18K HP
Left Click: Chomp
Right Click: Fire Ball
C: Slam Tail behind and Swing up Fire
X: Sharpen and SPIN (Sharpens the tail and deals MASSIVE DAMAGE)
Q: Tail Stab
R: Sharpen
O: Roar (Stuns)
Spacebar: Jump (No Animation Sadly)
Diet: Carnivore
Location: Carnivore Island on The Island

Glavenus Video of WHO Glavenus even is




Tigrex:
Level 1: 15K HP
Left Click: Titanic Chomp
Right Click: Pounce (not raptor pounce)
C: Tail Spin
X: Titanic Roar (Only roar in the mod to deal Damage while all other Stun)
Q: Rock Throw (Does melee damage with the claw as well)
R: MR. T. REX! IM GONNA KICK YOUR F-ing AFF! (Violently Charges Forward)
O: Charge Forward and turn Left
Diet: Carnivore
Location: Carnivore Island on The Island and The Redwoods of Fjordur

Tigrex Evolution From Game to Game




Diablos / Black Diablos:
Level 1: 15K HP
Left Click: Double Horn Swing
Right Click: TORO TORO TORO! *Bull noises* (Violently Rams forward)
C: Upward Horn Swing
Q: Tyrant Desert Roar
R: Stronger Upward Horn Swing (Stronger than C)
Spacebar: Dig
Spacebar (underground): Catapult Lunge (MASSIVE Amounts of Damage)
Diet: Herbivore
Location: Unknown

Diablos Monster Matchup by Papa Gabe




Black Diablos Monster Matchup by Papa Gabe




Its De Tobi Kadaaachi:
Level 1: 9K HP
Left Click: Quick Bite (SUPER FAST and Comboes over and over if you spam)
Right Click: Charge up (Makes all attacks have a chance to paralyze enemies)
C: Glide and SLAM
Q: Scream and Tail swing
Spacebar: Jump (Jumps super high and holding Spacebar lets you fall slower)
Passive Ability: Every Enemy Attack has a chance to MISS
Diet: Carnivore
Location: Beaches of Valgeuro (And possibly all other maps)

Tobi-Kadachi Monster Matchup by Papa Gabe




Anjanath:
Level 1: 15K HP
Left Click: Double Chomp
Right Click: Head Swing
C: Raging Fire Breath (Massive damage and causes burn)
X: Raging Roar (Wings show indicating Anjanath has a Attack boost and it stuns)
Q: Tail Swipe (Turns Anjanath around)
R: Flaming Combo (Does even more damage than fire breath and longer cooldown)
Diet: Carnivore
Location: Carnivore Island on The Island

Anjanath Monster Matchup by Papa Gabe



Barroth:
Level 1: 15K HP
Left Click: Head Slam
Right Click: RAAAAAAAAAMMMM
C: Multiple Tail Swings
Q: Roar (Stuns)
R: Mud Spill (Spills Mud Everywhere and slows any that touch the mud)
Diet: Unknown (I tried everything and it wouldnt eat chitin, berries, meat, and stone)
Location: Unknown

Barroth Monster Matchup by Papa Gabe




Big Chubby Jagras who is an ACTUAL WASTE OF SPACE:
Level 1: 6K HP (As Expected: The weakest large monster in the whole mod)
Left Click: Bite
Right Click: Bite and Bite
C: Belly Slam
X: Roar
Q: Spit
R: Jump high and slam that Belly (Seriously how the HECK is it suppose to jump)
Diet: Carnivore
Location: Unknown

Monster Matchup by Papa Gabe




Jagras:
Level 1: 900 HP (Alot for a Small Monster)
Left Click: Bite
Right Click: Another Bite
C: Back Up, Shriek, Jump, and Bite
Q: Back Up and Shriek (A Dodge)
R: Side Dodge (Randomly Dodges left or right)
Diet: Carnivore
Location: Beaches of Valguero and possibly other Maps

Tobi but he ate too many French Bread and got Poisoned:
Level 1: 10K HP (Stronger than normal Tobi apparently)
Left Click: Bite
Right Click: Dash and Slam Poison Tail (costs 6k stamina for some reason)
C: Glide and SLAM (Shoots Poison Quills)
X: Roar or somethin
Q: Glide and SLAM (Shoots Poison Quills. Why does it have 2 of these?)
R: Shriek and SPIN (Shoots Poison Quills)
Spacebar: Jump (Hold it to Glide)
Passive Ability: Same as Tobi-Kadachi: Look up at Tobi's section for the information.
Diet: Carnivore
Location: Unknown

Video of Viper Tobi or something




The Great Thunder Horsey itself, Kirin:
Level 1: 12k HP
Left Click: RAM
Right Click: Back kick and Foward Electro Shock
C: Forward Electro Shock
X: zhōngjí diànhuán! (Ultimate Ring of Electricity)
Q: Strike from above Electro Shock
R: Step back and watch the magic. *Multiple survivors proceed to DIE from electricity*
Spacebar: J U M P
Diet: Herbivore
Location: Unknown

RageGamingVideos go through the suffering of Fighting a Thunder Horse

https://www.youtube.com/watch?v=n7yeIxa3W1M


Testing:
Remember: Even the weakest of the weak can have thousands of HP :)