They need a goal, something that keeps them going.
I believe the answer is: Implementation.
The implementation development under this situation refers to the phase when an individuals start to take the details of the plan.
On the system in our current society, this usually happen after we graduate from university and started to carried out our life plan for our career.<span />
The answer is extortion. Extortion is considered to be an
offense when a person or group of individuals obtain or gets a property or
asset from another individual, because of a threat or fear and also by using
the authority of an official office. Extortion is already considered to be an
offense, once a person or group of persons started making a threat to another
individual, wherein there is a requirement of a payment of money or asset to
stop the threats, it is already considered to be an act of extortion.
I am pretty confident that the shelters were made from wood and bones. However, I could be wrong, so try to find another source. I hope that my "answer" was useful!