Each person is born with a
specific amount of something called soul energy. Soul energy can be
used to use magical abilities separated into four categories, but
when someone runs out of soul energy, they'll die. The four
categories are Offense (Weaponcrafting and/or energy blast type
things, or maybe coating weapons with soul energy to enhance the
power), Defense (Making shields or just using the energy to absorb
attacks), Healing (Pretty basic there), and Manipulation (Basically
anything-kinesis). When someone dies with soul energy left, the
soul energy can be absorbed by people nearby.