Terron

Deep in the bowls of the Underdark, there resides a race rarely seen by even the most well-traveled Underdark dwellers. Once great allies to the dark elves, it took only two betrayals to see their entire race enslaved by their former allies. After a mass revolt and exodus to the upper Underdark the now reclusive bat-like humanoid race of the Terron erect their roosts in the most difficult to reach locations under the earth. Avoiding most contact with outside races but ever plotting and scheming to strike back at the race they once called friend.

Suited for Suberranea

The Terron resemble flightless, bat-like humanoids. They have large ears that excel at picking up distant noise, eyes suited to darkness, clawed hands that give them peerless climbing ability, and dark skin to assist in hiding. A Terron male can be identified by the thick, matted mane that frames his head. The Terron can communicate simple concepts with bats, and domesticate them for use as perimeter scouts at the edges of their territory.

Revenge Minded

The Terron still hold a deep resentment towards the dark elves for their betrayal. Thus, they take great causion when interacting with other races, ever-weary of betrayal and reluctant to reveal too much information to anyone that hasn't gained their full trust. They rarely let anyone from a different race inside their roost, but occasionally take in refugees that may be deemed to have useful information.  The Terron aren't inherently malevolent creatures, unless betrayed in some way. A refugee taken into the roost is treated fairly, but is expected to pull their weight. Someone that has gained favor of a Terron can expect an enduring friendship, so long as that creature doesn't do anything to scathe their trust.

Scroll of Strange Races I

Terron

ability score increase: Choose one of: (a) Choose any +2; choose any other +1 (b) choose three different +1

age: Terron live short lives compared to other races, reaching maturity at 5 years old and living to 40.

alignment: Terrons are reclusive and rarely trusting of other races. They tend towards chaotic neutral.

Size: Medium

speed: Your base walking speed is 30 feet and you have a climbing speed of 30 feet

Languages: You can speak, read, and write Common, Undercommon, and Terron

race features:
Darkvision. You have superior vision in dark and dim conditions. You can see in dim light within 120 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern colors in darkness, only shades of gray.
Sunlight Sensitivity. While in sunlight, you have disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.
Screech. You can communicate simple ideas and concepts with bats. They can understand the meaning of your words though you have no special ability to understand them in return. You have advantage on all Charisma checks made to influence them.
Tenebrous. While you are in dim light or darkness, you can take the Hide action as a bonus action.
Claws. Your claws are natural weapons, which you can use to ake unarmed strikes. If you hit with them, you deal lashing damage euqal to 1d4 + your Strength modifier.

Civilization and Culture

Naming Traditions

Terron names and the Terron Language are unspeakable by other races. Thus, a Terron will often adopt a simple nickname when interacting with other races.