The Whole World Trembles

You don't understand. None of us do. Our ancestors, long gone from this plane of existence, survived the whole world nearly ripping itself apart, well, that's what they say, I bet it was one of those other groups, though.

The Whole World Trembles was a huge event that happened near the start of the war. When conflict was new to the world, there was a day when the whole world shook violently from side to side, damaging many buildings and killing or injuring many people.
Each side blamed the others for causing the tremors, and it wasn't until much later that it was discovered that the impact was felt only relatively locally, as two sections of the world ground against each other. By that time, though, the war had increased in intensity as everyone was blamed for causing the world to shake.
It is now thought that the Whole World Trembles was a worldquake which was more violent than the average worldquake, hence why it affected the whole of Adamantia, but that it could not have affected places located further away.
It is, however, still thought that one place must be responsible for the huge wave that devastated many Adamantian locations near or in the water, as there's no way that could possibly be linked to the seismic activity of the area, as it was to do with water and not land.

Manifestation

The event started with small tremors felt in the ground, they then spread and all over Adamantia people were experiencing enormous tremors, as if the ground was trying to tear itself apart at their feet.
Understandably, this was very shocking.
Following this, in the aftermath of everyone blaming each other for the tremors, a huge wave came over several settlements, further causing people to blame each other for the current natural state of the world.

Localization

Felt all over Adamantia, as it was a very large worldquake

Type

Natural