Immediate Disclaimer: I think Tomes is the best place for vampires, not a Ruler, not a culture. Here I present 2 Tier 3 shadow Tomes which could be used as a part of a shadow playthrough (which currently lacks an alternative T3 undead option), but are not too heavy on Undead Synergy and thus could be included into other builds.
Disclaimer 2: Numbers, if present, are very approximate, I don't pretend I tried to balance stuff. In most places the numbers are missing, use your imagination.
**New Tag: **Vampire
is Undead
has Mind Control Immunity
All attacks have Life Steal.
Deal additional +20% damage to bleeding targets.
Temporary HP can go higher than max HP up to 30% of max HP.
The Tome ideas are below in comments