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, high damage dealing 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)

Wildspire Waste

 * Barroth vs. Jyuratodus (tie, both take damage)
 * Barroth vs. Diablos (winner is 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)

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)

Rotten Vale

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

Elder's Recess

 * 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)

List of Monster Bond Attacks

 * Teostra & Lunstra (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)