Their eyes are very sensitive to light, causing them wear special goggles whenever they go above ground.

According to Nico di Angelo, they are capable of digging to and from anywhere, including Tartarus.

Enhanced Digging: Troglodytes can burrow through the hardest of materials.Stealth: Troglodytes are stealthy, being able to sneak up on others undetected and take them out without realizing it.Superhuman Speed: Troglodytes are extremely fast runners.After directing Nico and Will to Gorgyra for help, the trogs invite them both to visit when they return and depart after sharing a look that suggests the two trogs would've gotten emotional if they'd stayed any longer. The trogs reveal that the Acheron is their shortcut and they haven't been able to find a better one despite looking. Screech-Bling and Hiss-Majesty agree to help the two and aid them in defeating two drakons before leading the demigods to the River Acheron. To Will's surprise, Nico reveals that he relocated the trogs to the Underworld following the destruction of their previous home where they will be even safer as long as they avoid Hades' notice. Two months later, Nico and Will seek out the trogs help with their quest. The Sun and the Star: A Nico di Angelo Adventure As Hades has forbidden anyone from ever going into Tartarus again, Nico intends to enlist the help of the troglodytes who can dig to and from anywhere, even Tartarus and can thus get Nico and Will in and out safely.

Nico and Will intend to travel to Tartarus and try to find out what happened to Bob, rescuing him if possible. Two weeks later, Nico reveals to Apollo that he believes that his friend Bob the Titan has been calling out to him for help from Tartarus. Apollo suspects that Camp Half-Blood is about to be flush with Greek Fire and Imperial Gold weapons while the trogs will have a fabulous new selection of haberdashery and whatever lizards and rocks they can find. After Nero's death, Apollo notices them discussing the split of the spoils of war with Sherman Yang. In the Battle of Nero's Tower, the troglodytes disarm Nero's deadly gas, preventing him from massacring everyone in New York and later in the tower itself. Nico di Angelo, Will Solace and Apollo enlist the help of the troglodytes against Nero, eventually being joined by reinforcements from Camp Half-Blood.

2 The Sun and the Star: A Nico di Angelo Adventure.

Trials of apollo the tower of nero