Other than this Grass Mat, there was truly nothing else in the entire room. However, the Soul Martial Arts it contained encompassed the entire collection of the Divine Seal Sect. In fact, some weren't even available in the Divine Seal Pavilion and could only be revealed by passing a soul assessment.
This room was, in essence, an assessment Stone Stele. Only by demonstrating the required level of skill would one be granted a corresponding Soul Martial Art. The stronger the ability, the more powerful the Soul Martial Art.
Soul Martial Arts were no different from ordinary Martial Arts, divided into Human, Earth, and Celestial Levels, with Celestial Level Martial Arts being the highest. Obtaining a Celestial Level Martial Art required an exceptionally powerful soul. If one's soul wasn't strong enough, the most one could receive was an Earth Level Soul Martial Art.
