Entish

Entish, the ancient tongue of the Ents, emerges in The Two Towers as a profound auditory phenomenon characterized by deep, slow musical chanting with booming rhythms and endlessly growing names that unfold like epic stories, reflecting the timeless patience of Middle-earth's tree-herders. Though introduced solely in the second book, it underscores the Ents' pivotal role in the War of the Ring, symbolizing a language so deliberate that a single conversation can span hours or days. Across the series, Entish remains a singular, unchanging emblem of natural endurance, with no further evolution detailed in later volumes, yet its introduction catalyzes the Ents' march on Isengard, altering the fate of Rohan.