Idea:Monster Interaction System

The Monster Interaction System is a more robust version of the Turf Wars mechanic seen in Monster Hunter World. With this system, monsters can fight against or alongside each other for various reasons.

Predator-Prey Interactions
If two monsters share a natural predator-prey relationship, the prey will attempt to escape the predator but will stand its ground and fight if it cannot flee. The results of this conflict can be devastating as the battle between the two monsters can dramatically alter the environment around them even if they are not specifically targeting the hunter.

Rival Interactions
If two monsters share a similar niche and territory (for example, Rathalos and Seregios), they will first perform threat displays to each other in an attempt to scare their rival off. If neither monster backs down, the two will fight, although not necessarily with the intent to kill.