|Clothing optional apparently....|
So, what follows is the sub-race description for turning your elf PC into a Shadow Elf (or Glwyrr'Syth in my world)
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GLWYRR'SYTH (SHADOW ELF) SUB-RACE
Ability Score Increase: +1 Intelligence
Superior Darkvision: You can see perfectly in total darkness and shadowy conditions, up to 120'.
Born of the Deep Fires: The Glwyrr'Syth tend to live near areas of volcanic activity, and have an innate Resistance to Fire
Born to the Shadows: Glwyrr'Syth are naturally stealthy. They are automatically proficient with the Stealth skill, and may add twice their proficiency bonus to Stealth checks.
Cavern Born: Glwyrr'Syth cannot become lost in natural cavern complexes or similar areas, and always know which way is North.