User blog comment:Kogath/Monster Hunter: World Discussion/@comment-24734669-20190831003916/@comment-38816563-20190831153219

All turf wars we have are pure physical combat, they never use there elemental attack against each other at all, except that Rathian shot fireballs at Diablos and Lunastra use Counter Nova against Nerg. Or it could be that these monsters, despite existed for very long time, don't know or remember other monsters elemental weakness.