With so many different monsters in Monster Hunter: World, it can be difficult to remember which damage types and status effects each one is weak against, but exploiting these weaknesses can be vital to bringing them down.
While players may wish to look at augmenting their weapons and armor to gain an additional edge against their prey, the primary concern for hunters should be what damage types and status effects each monster is weak or resistant to. In Monster Hunter: World, there are six elemental damage types; Fire, Water, Thunder, Ice, Dragon, and Blast, and there are also four different status effects which can be applied to monsters; Stun, Paralysis, Sleep, and Poison.
Every monster in the game is weak to some of these and resistant to others, and the list below details exactly what each monster's weaknesses are. The list is split between regular monsters and the game's Elder Dragons, which appear only in the late stages of the game. Finding and completing Elder Dragon investigation missions can be tricky, so players should take care to exploit the Elder Dragons' weaknesses.
Monsters:
Anjanath
As one might expect, the fire-breathing Anjanath has a high resistance to both Fire and Blast, so hunters should avoid those forms of damage when attempting to bring down one of these brutes. Anjanaths are also quite resistant to Poison, though other status effects affect them normally. Its key vulnerability is Water, which it has next to no resistance against.
Barroth
Blast damage is the best friend of hunters going after this dweller in the Wildspire Wastes. The Barroth is unusual amongst Monster Hunter: World's many beasts in that when it coats itself in mud, its resistances and vulnerabilities change. Blast, however, is highly effective against both stages. When the Barroth is uncovered, it is also vulnerable to Fire, but practically immune to Water. Once it has coated itself in mud, these switch and it becomes vulnerable to Water and highly resistant to Fire. In both forms, it is almost immune to Thunder, and resistant to Dragon-type damage. When it comes to status effects, Barroths are susceptible to both Poison and Paralysis, but Sleep, and particularly Stun, are less effective.
Bazelgeuse
As one of the strongest monsters in Monster Hunter: World, besides the Elder Dragons, Bazelgeuse has few weaknesses. The only damage type this beast is vulnerable to is Thunder, but it is all but unaffected by Fire, and resistant to Water and Blast, as well as the Stun status effect. Other status effects should be able to affect it normally. Given this monster's speed and diving ambush attacks, hunters should consider arming themselves well to exploit Bazelgeuse's weakness to Thunder.
Diablos
Known as the "Horned Tyrant," this apex predator of the Wildspire Wastes can be tricky to bring down due to its penchant for bursting up from beneath the sand. Hunters having trouble with this monster can turn to both Ice damage and the Paralysis status effect, both of which Diablos is highly vulnerable to. Hunters should avoid Fire, which Diablos is all but immune to, as well as Thunder-type damage and the Stun status effect, which the beast is resistant against.
Black Diablos
More aggressive, female Diablos, the Black Diablos has the same resistances and vulnerabilities as its more common counterpart, but with a high resistance to Dragon-type damage. Hunters going after this beast may wish to exploit its weakness to Paralysis with the use of Shock Traps and other effects.
Dodogama
This explosive monster is, as one might expect, almost immune to Fire and highly resistant to both Blast and Dragon. It is vulnerable to Thunder-type damage, however, as well as the Poison status effect, though it is vulnerable to all of the other status effects to a lesser degree as well.
Great Girros
Dwelling in the effluvia-choked caves of the Rotten Vale, the Great Girros can be tough to deal with due to its ability to call on packs of lesser Girros to fight alongside it. Hunters who aim to bring down one of the beasts may wish to arm themselves with Water-type weapons or ways to inflict the Sleep status effect, as the Great Girros is weak against both. The monster is highly resistant to Paralysis and Dragon, however, and almost immune to Thunder-type damage.
Great Jagras
The first monster that hunters are tasked with bringing down in Monster Hunter: World, the Great Jagras is highly resistant to Water-type damage, and has significant resistance against Dragon as well. However, it is weak against almost everything else, including Fire and Blast, as well as all four status effects, although plenty of hunters may not feel the need to optimize against this relatively weak creature.
Jyuratodus
Like the Barroth, another beast which shares its territory in the Wildspire Wastes, the Jyuratodus has slightly different resistances and vulnerabilities depending on whether it is coated in mud. At all times, the monster is resistant to the Dragon, Ice, and Blast damage types, as well as the Paralysis status effect, though it is also vulnerable to Stun. When coated in mud, the Jyuratodus becomes almost immune to Thunder and Fire, but becomes very weak against Water-type damage. When the mud has been broken off, its resistance to Fire decreases somewhat (though it is still quite resistant), while its vulnerability to Thunder and Water is reversed, becoming weak against Thunder and highly resistant to Water.