Chartered in Royal Year 618, the Guild of Adventurers Upon Return, was intended as a guideline to deal with and control the increasing number of men and women who were taking up arms and pursuing a career in heroism and adventurism. The guild would police it's own, and function as an odd jobs mercenary corporation, subservient to the crown, and supportive of the clerics.
"Binding the Life Coil" is an ancient quasi-mystical technique rediscovered to prolong one's life at the expense of one reproductive ability. It is a simple magikal technique that anyone can learn (a skill or feat). The promise of near immortality or a lifespan of a thousand years or more makes everyone want to learn it.
This technique has a price though, the amount of immortality is in direct response to the strength of ones reproductive spirit. Those that have never breed will live longer than those that have. The use of the technique makes conception difficult, if not impossible. So you trade the future of your society for the chance for you to see much of that future.