Sky-Tomb is the spaceship headquarters and fortress of the Lunataks on Third Earth, it is just as large and powerful as the Thundercats' Cats Lair. It is built with highly advanced technology, the Lunataks claim it is more advanced than mutant technology (though this may just be hubris), it can uphold more than 10X more thundrilium in stock than the Thundercats Cats Lair. However the Sky-Tomb uses up Thundrillium Faster then The Cat's Lair. Skytombs interior also houses a Stealthed Trap Door near the Entrance to trap enemies.