Shadowsong

They are often seen surrounded by shadows and have the ability to feel and hear things that others can't they can control and manipulate shadows, merging into them.

Once per short rest you can learn 5 words from the shadows. Particular words and their meanings are beholden to the DM's discretion and manifests as disembodied whispers that are chant and the words the DM chooses are the only ones that you can make out of the string of chanting.

You can use misty step once per long rest without expending a spell slot. 

When in dim light stealth checks are made at advantage and checks made to discover your location have their scores reduced by a die corresponding to your level (1d4 for lvl 4, 1d6 for lvl 6 etc...).