[Endoperez]

Bogarus also gets Astral, so Rings of Sorcery should help. In addition, there are three Blood boosters item that only take blood: Blood Athame, Brazen Vessel and Armor of Souls. Even a normal B2 Staret with those four can cast up to B6 spells, and you can give those items to any uniques you get.

Besides, empowering in Blood is much easier than empowering in other paths, because it's so much easier to get high Blood income. Just remember to empower a Staret and not a Fivefold Angel, because Starets can use Dwarven Hammers when forging boosters.