My tribe was decimated by a mysterious disease followed by a severe drought (you really need to ease up on the negative 'chance cards'!

) My current population is just 4 (2 adults of breeding age, a child of 2 and a baby). My master builder was one of those who died and I'm left with a trainee. As I have rebuilt the ruins and carved the idol; what else can I do to advance him to 'Master' so that I can find the treasure? Obviously the population's not large enough to warrant the building of any more huts.
I'd be a shame to have to begin again

- I have researched everything fully - bar fertility and medicine - and I've only 5 challenges to complete.
Cheers
Claire