Guard

The Royal Guard (衛兵 eihei) are powerful entities within the game of Elder Tale that are charged with maintaining security and public order within cities and safe zones (戦闘行為禁止区域). They appear whenever a fight breaks out in these places, and if the players involved don't stand down, they will either be killed or taken away to a jailhouse. Guards are actually special level-100 NPCs.

It seems that the Royal Guard are seemingly the only ones not affected by the Apocalypse, possessing almost no personalities or backgrounds unlike the People of the Land and Ancients.

Appearance
The Royal Guard appears as black, armored knights wearing long black capes, wielding either a battle-axe or sword. Some Guards are also seen dual-wielding their weapons. They teleport from a ball of blue light and float in mid air whenever players in cities or safe zones are about to fight. These mobile suits donned by the Guard are a legacy of the now-extinct Alvs.

Abilities
The Royal Guard, while in their mobile suits, are capable of teleporting anywhere within Player City walls. However, these suits can only be used within those walls due to the giant magic circle underneath the ground that allow for its movement. All Royal Guards are around level 110 in order to be capable of putting down violent Adventurers.

Royal Guards are capable of monitoring the actions of Adventurers and People of the Land, but not their fellow Guards. All Guards' actions are deemed to be enforcement of security, and so any Guard that strays from their normal duty won't be detected.

The Battle of Loka
The Royal Guard was mentioned when Shiroe and Marylle discussing of the rampant Player Killing as seen that a trio of Royal Guards appearing out of nowhere and quelled the fight between Adventurers about to clash.

Volume 6
A Royal Guard becomes possessed by the sword that contained the soul of an Ancient Raid Boss, Lugrius. He kills West Wind Brigade member Kyouko, inciting the rage of Soujiro. For the next week, this "Murderer" kills several Adventurers, including a patrol team from Honesty. In an attempt to defeat it, both Soujiro and later Akatsuki die attacking the Raid Boss-Guard.

Later, a member of the Kunie clan, Kinjyu, approaches Raynesia with the news that a Guard had stolen one of the mobile suits

Because of the possessed Guard's ability to use the teleportation system to escape pursuers and find new targets, the Round Table members present are forced to shut off Akiba's Royal Guard System. Not only did this stop the Royal Guards from appearing in case people fought within city walls, it also meant that monsters, which were usually kept from entering the city by the Guards, were now free to enter the city unless stopped by Adventurers themselves.

West Wind Brigade
A Guard appears after Isami attacks another player that was assaulting her and Sara. When he targets her, Soujiro blocks the attack to save her, but loses one of his katanas in the process. Soujirou himself becomes a target after he slices off the sadistic player's arm, and subsequently dies after holding off the Guard to let Isami escape. Seeing its other target gone and Soujiro dealt with, the Guard left.