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We ended finding around 12 more of these black crystals inside the Vampire's corpse, they were all almost drained of their energy, so the Vampire was using them all to somehow receive a great boost to his power. His body also looked worn down, passing through the barrier perhaps put a bit strain on his body, perhaps this is why he ended allowing Julia to struggle so much, as he ended weakened and tired when he came to finally kill her, and was surprised that she had some strength herself.
"We can assume that these Vampires are far too rotten…" Sighed Julia.
"Now what do we do with the corpse?" Wondered Emiliano. "I don't know if my magic is strong enough to purify such a high level Undead as Vampires."