Duergar Heritage

Your Duergar heritage gives you access to a multitude of powers. 

Magical Heritage: As a bonus action, you can cast enlarge/reduce and invisibility on yourself twice per long rest, without requiring material components. You can also cast these spells using any spell slots you have of the appropriate level.

Dwarven Heritage: As an action or out of combat, you can touch a part of a stone floor, wall, door or ceiling and feel the vibrations made by other creatures moving around on that surface in a 30ft area. You can make a perception check to obtain additional information on the ground you are standing on.

Underdark Heritage: You can cast counterspell once per long rest, except if you are standing in sunlight.