Duergar warrior (OC)

Also known as gray dwarves, the duergar are from the Underdark and are the evil cousins of the surface dwarves.

Special abilities
Duergar warriors are immune to paralysis. They can cast invisibility as a spell-like ability with a caster level of 3 for the level 1, 10 for the level 5, and 15 for the level 10 and above.