Though an extremely young interstellar state, the T'au possess some of the most advanced weapons and equipment in the galaxy. Their mysterious and remarkable leaps in technology and culture have allowed them to become a true threat to Imperial domination in their region of the galaxy.
Many species (including humans) have voluntarily joined the ranks of T'au society because they were impressed by their concept of collective betterment. Though the T'au claim to be a primarily peaceful species, asking if others will join their cause voluntarily instead of fighting against them, they are not above conquering resistant worlds with force. Sometimes one must sear the flesh from the bones of those who stand opposed to progress, for the Greater Good.