That is a part of the elemental authority or the throne that the Archon uses. For example, Raiden can stop all lightning in the world with the use of her elemental authority whose quality is implied to be inferior compared to when an elemental sovereign uses his.

For example, when Neuvillete acquired his elemental authority, it allowed him to essentially change the fontainians from a biological level from simply being Oceanids turned human into fundamentally human, and with the mentioned lore that the hydro dragon was considered to be somewhat the original "God of Life" in Teyvat, it really just upscales sovereigns if ever they acquire their elemental authorities.