Naygen did much to encourage the growth of the Major Guild of Fine Artists, as well as seeking other "truths." Naygen was clearly not one who knew the original beliefs of Ri'neref. Naygen praised the play on the Pento War written by Sirreh and hosted by Eamis Theatre Company, an influential work which started the D'ni Renaissance.
In 2488 the first successful extrusion tests were carried out by the Guild of Miners, and to great applause from the public. Naygen's major causes throughout his reign were to encourage growth in mining as well as the arts. Naygen used the occasion to "benefit everyone" and appointed the Guild of Miners as a Major Guild replacing the Guild of Fine Artists, which was then split into the Minor Guilds of Sculptors, Artists, Actors, and Musicians. His proposal was strongly supported by Sirreh, Airem, as well as other artists, who viewed it as an excellent opportunity for the growth of their respective fields. In the christening speech for the Guild of Musicians, Naygen praised the musician Airem and the people for accepting it.
In 2500, Naygen proposed the construction of a new Council Chamber for the Guilds, over the Tomb of the Great King. The proposal was met with little opposition, mainly by the official Church who registered a complaint. Even a prophetess of Naygen supported the proposition, and construction began in 2502. In 2504 the Tomb of the Great King was barely visible, a tremendous symbol of what D'ni had become. Naygen apparently became enamored with the mystical patterns of the Tomb and spread them throughout the unseen portions of the chamber as well as the seen.
Naygen publicly encouraged the saving his money for future generations and collected a tremendous amount of royal wealth which he hid in a massive vault within the Council chamber, protected by "puzzles" of a sort.
Naygen died in 2533 at the age of 263, leaving the throne to his third son Hinash. In memorial of Naygen, Sirreh wrote another of the more popular of his plays entitled "Our Great King". His secret vault was discovered years after his death.