Dwarvish

Dwarvish (called "Khuzdul" in the Dwarves' own tongue) is the umbrella term for the family of languages and dialects spoken by dwarves across Talus. Dwarvish is almost as old a language as Elvish, having been developed soon after the Dwarvar first stepped from the bowels of the earth in the Days of Fury. The language served as the basis for initial intelligent society below the surface of the planet; dwarven culture was so proud of its elaborate written and spoken speech that it incorporated Dwarvish into its architecture, weapons, and mystical items. This helped easily propagate Dwarvish into other cultures, who borrowed Dwarven script or pronunciations into their own developing languages.

Script
https://www.worldanvil.com/w/amberground-Solya/a/dwarvish-article

Dwarvish script is one of the longest lasting scripts, still used largely in its original form since the First Age. With the rapid propagation of the language throughout the early peoples of Altheris, many other species adapted Dwarvish in script if not in speech, and use it as their writing system. The simple and easy-to-read structure allowed some Dwarvish to even influence Common script in multiple instances across the world.