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.

Appearance
The Royal Guard appears as black, armored knights wearing long black capes and wielding either a battle-axe or sword. They from a ball of blue light and float in mid air whenever players in cities or safe zones are about to fight.

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.

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. 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 player's arm, and subsequently dies after holding off the Guard to let Isami escape.