A 'War Power' is not something used to describe a country, Magnus. The title is given to an individual that has the power to rival an entire Nation, by themselves. They are named such by the World's Rulers that all agree, even during times of war, that these individuals are to be given unique rights to ignore most laws and travel as they wish. It is the admittance of the world's leaders, their kings, emperors, and lords saying that even with their entire empires backing them: they cannot afford to anger these individuals.
— High Wizard of Camelot, War Power, Merlin

War Power

There are few true "War Powers" within the world or even listed throughout history. The title was introduced during the year 92 AR to represent the leader of the ancient Akemu, Seiken. After standing up to not only the entire Draconian Dynasty, but holding it hostage against the Celestial itself. Using his power to form the world's third moon Third Moon; Barragan, and threatened to drop it on top of the planet. Directly over Celestia, if they didn’t allow Senko to retain its culture.

Afterward, the Dynasty reached out to the other countries of the world. Informing them of the threat level that the man posed to any that stood in his way. With this, the first "War Power" was born. There have only been a total of three to exist ever since, including Merlin in their ranks, making the standard nearly impossible for most to reach.

Benefits

Despite the difficulty level of reaching such a state, requiring fame and power rivaling that of an entire empire's own, War Powers are not without their benefits. Due to rulers of entire nations, countries and empires granting you diplomatic immunity War Powers are allowed to do as they wish anywhere they go. Though individuals are welcome to attempt to stop them from performing illegal activities, doing so is understood to be done with no backup from their own country in the slightest. If one survives from trying to stop a War Power, they are generally put to death, brutally by their country.

This is due to the simple fact that if someone has been given the title of a War Power, they were given such a name to avoid angering them. In risking such, they risk the War Power attacking the ruling nation, spelling the equivalent of a natural disaster on the entire land. With this immunity, a War Power can request anything, of anyone, and generally get away with it. Though they may be begged to have mercy, no one can truly stop them aside from another War Power, or someone willing to wage the lives of their every citizen against them.