User blog comment:Kogath/Monster Hunter: World Discussion/@comment-24734669-20190727053353/@comment-5158920-20190728082419

On the Capcom USA instagram they mention "Diablos is no longer the Apex in Iceborne". Either they're just saying that to hype of Glavenus or they downgraded Diablos to Rathian power levels or something.

Still there has to be more to that turf war. It doesn't seem to be an end since Glavenus still has Diablos held there and it would be stupid if it just let go. It also doesn't use it's tail....

Meanwhile in a scene where it hunts and eats Apceros it uses it's tail.