Turf War

Turf Wars are a mechanic introduced into Monster Hunter World. When two monsters meet, they might engage in a cinematic battle where either one or both monsters take significant damage and drop an item.

Bond Attacks are a mechanic introduced in to Monster Hunter World with the introduction of Lunastra as a DLC. They are a special attack that has two monsters fuse their attacks together to create a massive, highly damaging attack. So far the only monsters that can do this are Teostra and Lunastra.

Ancient Forest

 * Great Jagras vs. Anjanath (winner is Anjanath)
 * Tobi-Kadachi vs. Anjanath (winner is Anjanath)
 * Anjanath vs. Rathalos (winner is Rathalos)
 * Anjanath vs. Azure Rathalos (winner is Azure Rathalos)
 * Rathalos vs. Deviljho (winner is Deviljho)
 * Bazelgeuse vs. Deviljho (tie, both take damage)
 * Rathalos vs. Nargacuga (tie, both take damage)
 * Rathalos vs. Tigrex (unknown, likely a tie)
 * Rathalos vs Glavenus (random outcome for who wins)

Wildspire Waste

 * Barroth vs. Jyuratodus (tie, both take damage)
 * Barroth vs. Diablos (winner is Diablos)
 * Barroth vs. Black Diablos (winner is Black Diablos)
 * Rathian vs. Diablos (winner is Diablos)
 * Pink Rathian vs. Diablos (winner is Diablos)
 * Rathian vs. Black Diablos (winner is Black Diablos)
 * Pink Rathian vs. Black Diablos (winner is Black Diablos)
 * Diablos vs. Black Diablos (random outcome for who wins)
 * Diablos vs. Deviljho (winner is Deviljho)
 * Diablos vs. Glavenus (tie, both take damage)

Coral Highlands

 * Paolumu vs. Legiana (winner is Legiana)
 * Tzitzi-Ya-Ku vs. Odogaron (winner is Odogaron)
 * Paolumu vs. Odogaron (winner is Odogaron)
 * Legiana vs. Deviljho (winner is Deviljho)
 * Legiana vs. Ebony Odogaron (tie, both take damage)
 * Nargacuga vs. Ebony Odogaron (tie, both take damage)
 * Nargacuga vs Fulgur Anjanath (tie, both take damage)
 * Zinogre vs Fulgur Anjanath (tie, both take damage)

Rotten Vale

 * Radobaan vs. Odogaron (winner is Odogaron)
 * Odogaron vs. Tigrex (tie, both take damage)
 * Odogaron vs. Vaal Hazak (winner is Vaal Hazak)
 * Acidic Glavenus vs. Tigrex (tie, both take damage)

Elder's Recess

 * Brachydios vs. Azure Rathalos (tie, both take damage)
 * Brachydios vs. Tigrex (tie, both take damage)
 * Ebony Odogaron vs. Uragaan (winner is Ebony Odogaron)
 * Teostra vs. Kushala Daora (tie, both take damage)
 * Teostra vs. Nergigante (winner is Nergigante, both take damage)
 * Lunastra vs. Kushala Daora (tie, both take damage)
 * Lunastra vs. Nergigante (winner is Nergigante, both take damage)
 * Kushala Daora vs. Nergigante (winner is Nergigante, both take damage)

Hoarfrost Reach

 * Beotodus vs. Banbaro (tie, both take damage)
 * Banbaro vs. Barioth (winner is Barioth)
 * Fulgur Anjanath vs. Tigrex (tie, both take damage)
 * Fulgur Anjanath vs. Viper Tobi-Kadachi (winner is Fulgur Anjanath)
 * Fulgur Anjanath vs. Barioth (tie, both take damage)
 * Barioth vs. Legiana (tie, both take damage)
 * Barioth vs. Shrieking Legiana (tie, both take damage)
 * Savage Deviljho vs. Velkhana (tie, both take damage)

Guiding Lands

 * Zinogre vs. Rathalos (tie, both take damage)

List of Monster Bond Attacks

 * Teostra & Lunastra (when both are in the area and are enraged, they will merge their supernovas together creating a wide range attack that deals a lot of damage)