The War between Lensmoor and Antrippa is an ongoing one, a fact that means more to some players than others. Non-player characters constantly do battle in many of the game's zones and that fact is mirrored socially among players.
Dealing with the war is entirely optional, you could choose to stick to your own land and never say a word to the enemy, but for those who wish to participate, here is some information.
As blood enemies it is expected that they are to be downright rude to each other in-character; as a result of this, many a PK (player killing) tends to follow interactions between people of opposing continents. People are expected to not get along with the enemy land - fraternizing (playing-nice) with the enemy may negatively impact your reputation, and even cause bad things to happen to you.
The war has a life of its own through countless ages of blood and anger. This anger will likely turn your way if you try to stop it; attempts at making peace will only anger the gods of your land who are at war with the gods of your enemy's land. (Angering the gods is not recommended.)
Going to an enemy land is never a safe thing to do. Even if you are an NPK (Not PK), the NPCs present such as Town Guards will all attempt to kill you. Although PK players may not be able to kill you, they can still have you removed from the continent if you are caught trespassing.
Those who are PK while visiting enemy territory may be attacked on sight, at any time, by enemy players who are protecting their land.