Quote Originally Posted by Daishain View Post
Even leaving aside whatever undefined nasty stuff will happen without this bloodline...

The lack of an heir in a feudal society typically leads to a lot of chaos and death. Exactly how much chaos occurs depends on a lot of different factors, but it is not unreasonable to say that the Prince failing to do this particular job risks the lives of each and every citizen under his rule.
There's chaos and death regardless. Smooth power transitions in feudal society are a joke. It's often worse without an heir, but there tend to be messes regardless.

As for the actual topic, artificial insemination should work. It's not like the technology behind them is really all that sophisticated, and the emperor has the budget to have things machined to high precision. Plus, you know, magic.