Terra is the second city you can travel to that holds a Gem Leader, the first being Herba. It is a nice city that has an underground mine system. The city is mostly deserted, with only a few dozen residents. When you have finished fighting all of the trainers that are loyal to the city's Gem, you are able to fight Blue Bruin, the Gem Leader of the Earth-Element. This is the only city in which Earth Dragonballs are able to be purchased for 150 , which are good for capturing wild Earth Element Dragonmon.