Arien Achilles

Arien Achilles (アリアン アキレス, Arian Akiresu) is one of the three Honor Captain-ranked Rune Knights in the world, alongside Alyssa Deschain and Asteria Dike, but is the only long-term Honor Captain, compared to the new recently promoted Captains, making him a vetran. As a veteran, Arien has been a Rune Knight for almost 30 years, proving to be loyal and an effective member, only improving as the years went by, eventually reaching the legendary rank of Honor Captain.

Upon discovering God and Dragon and mastering said magic, Arien's reputation and fame increased, and he was hailed as the Saint Dragon (聖竜, Seiryū), a "dragon in human form", a claim which, for all intents and purposes, is false, and even ridiculous. As a veteran, Arien is the most experienced of his colleagues, and thus is known as the "strongest Rune Knight", and is considered the Rune Knights' prime poster boy alongside his fellow Honor Captains.

Trivia

 * The name Arien is greek for "Most Pure", while Achilles is greek for "Nation" or "Grief", thus his name roughly means "The Most Pure Nation/Grief".