SDRs haven't boosted hunting for non-blood mages since late D2.
As it is, if memory serves (the manual has this detail), the SDR effectively raises blood level by 1 for hunting purposes only, for a mage who already has B1+.
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Are we insane yet? Are we insane yet? Aiiieeeeee...
Is the SDR +1? I was under the impression it was +2.
The manual doesn't seem to say - it just says 'blood hunt bonus for blood mages'.
It's definitely a bonus to effective magic level though, so it affects both the chance of success and the number of slaves captured.
I think that demons are immune to disease, anyone know for sure?