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After giving a glance to my new Skill, I was left rather satisfied. Not only it could turn already existing, dead Familiars into even more upgraded Undead Familiars, but the Vampire Familiar weaknesses disappeared for some reason.
It does still keep several of the previous Skill effects, as stated here.
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By combining the forces of Death, Souls, Shadows, and Blood of your Familiars or any available corpse that is fresh enough, and with their original soul nearby, it is possible to revive them into Abyssal Vampiric Undead Familiars after their death. Familiars that die will leave Ethereal Corpses to revive, while others non-Familiars will require their physical corpses and remaining souls to revive.
