Vitality is a towny/faction server. You can claim land to prevent others from griefing your land. Claiming your land doesn't mean your safe from complete harm. Other players can still come into your land and attack you. Other towns, or Nations can also attack you by declaring war on your town/nation and claiming each chunk till they reach your home chunk. You can ally other towns/nations and well as merge with bigger nations under their rule as a town.