Calamities
When Minos noticed that the area where several powerful beings should have been sleeping while searching for new advancements was empty, he immediately noticed a serious problem.
Beasts, especially high-level elder beasts, wouldn't move from their positions without strong motivations, without feeling a bad premonition.
For all the beasts in an area like the one Minos and his crew had just passed through to have moved, there had to be more to it than curiosity about a war or confrontation.
High-level beasts only acted so defensively when they felt threatened!
And threats from other races didn't cause this kind of reaction!
The Spiritual World has existed for a long time. Even though there had been conflicts here and there for practically every generation, they were ordinary conflicts that wouldn't disrupt the natural order of things.