Xylith, known as The Obsidian Flame, is a 5-star Pyro element character from Natlan affiliated with The Glass-Makers of Teteocan. She has a medium female physique, characterized by striking ash-grey hair and bright amber eyes. Her outfit consists of a specialized glassblowing attire reinforced with obsidian, highlighting her artistic and temperamental nature. Xylith's combat abilities include rapid strikes of molten glass, an Ember-Core attack that inflicts a "Vitrified" status, and a powerful Elemental Burst that offers shields to teammates and AoE damage to foes. Her unique personality traits, including eccentricity and perfectionism, are reflected in her crafting skills and deep appreciation for the fragility of beauty.

Xylith is a character known for her mastery of glass-making in the volcanic valleys of Natlan. She enhances combat abilities through her skills: the Kiln Field boosts active characters' Elemental DMG by 15%, and her Normal Attacks release additional Pyro DMG. Ascension requires various materials, including Mora and Agnidus Agate. Xylith's base stats at level 90 include 10,875 HP and 282 ATK. Her character story illustrates her journey from a guild member to an independent creator, emphasizing her unique glass-making technique that combines art with elemental energy, making her creations both beautiful and perilous. Her Pyro Vision symbolizes her intense ambition and transformative abilities, allowing her to reshape reality. Voice lines reflect her fiery personality and passion for her craft.

Xylith, referred to as "she/her," describes her artistic connection to the earth's marrow through a metaphorical pile of dirt. She asserts that fire, often perceived as chaotic, is actually the most disciplined element, strictly adhering to the laws of heat and fuel. Additionally, she introduces "Mood-Silica," a color-changing glass created by melting Cryo Slime condensate with Pyro Whopperflower nectar. Her ascension phases illustrate a progression of heat and transformation, culminating in a powerful self-identity where she embodies the "Obsidian Flame," claiming the ability to reshape the world with her artistry.