[chrispedersen]

chance of finding blood slaves is 10 + 40*level. so blood 3 will guarantee finding.

However, you also have to make a population check (pop/5000 %) and if you make a unrest/4 % check you fail.

All three checks must succeed to get blood slaves. And you then generate d5 +d(slaves) unrest.

I did all that by memory.. so I may be off. Some units get a blood hunt dowsing bonus too.