the people of the spellbinder world are ignorant of the true nature of the spellbinders' technology. to them, their power suits and flying ships are magic. the spellbinders exploit this belief in order to maintain control over the people and use them for labour. some people are allowed into the spellbinder castle as servants, while exceptionally bright ones are taken on as apprentices to the spellbinders. there is some degree of nepotism involved in the process though, as gryvon is clearly only chosen to be an apprentice because his father is the summoner of clayhill.