Royal Guard (Quel'Thalas)

The Royal Guard were proud defenders of high elven society. They arrived to the ruined Quel'Thalas alongside Prince Kael'thas following the Scourge invasion.

Following the mass conversion of the high elven survivors to the blood elves, many members of the Royal Guard—who came to believe that the Light had failed them in their hour of greatest need—went on to join the newly-founded Blood Knight order, a prominent group of sin'dorei paladins under the command of Lady Liadrin.

Speculation

 * Whether there was any Royal Guard in Quel'Thalas is not stated but if there was, it would be under the command of Anasterian Sunstrider. They would be decimated or utterly destroyed following the fall of the kingdom.
 * Selin Fireheart is said to have been a captain of Kael'thas' personal guard which might refer to the Royal Guard.

Royal Guard force?
It is possible that the Royal Guard was reformed following the Scourge invasion, despite many of its members going on to become Blood Knights. The royal guard force of Quel'Thalas' regent, Lord Lor'themar Theron, bears the name of the organization entirely, without even supplementary titles or honorifics (such as, for example, Stormwind Royal Guards), perhaps suggesting the Royal Guards of Quel'Thalas belong to the same organization as their moniker.

Role and duties
Little is known of what exactly the Royal Guard's duties were, aside from the stated goal of defending high elven society. Due to their name, it is possible that they served as the personal guard force of the royal family, which would also lend credence to defending Regent Lord Theron.