Vampires

The vampire is a powerful undead creature, feeding on the living to further their own twisted goals. Vampirism can infect people of many different species, though the effects are often unpredictable.

Negative Plane Protection

When fighting a vampire, parties are advised to use the Negative Plane Protection spell against level drain. If a character has been level-drained, the levels may be restored through the Restoration and Lesser Restoration spells, available at any temple.

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Source: bg2ee/original_manuals/baldurs_gate_2_ee_amn_survival_guide.pdf — "Some Monsters of the Sword Coast" → "Vampires".