Vepar

Vepar is a formidable entity within demonology, specifically recognized as a Great Duke of Hell who commands 29 legions of demons. His primary sphere of influence lies with the waters, where he governs their movements and is notably associated with naval warfare. Vepar possesses the ability to manipulate the seas, capable of conjuring rough and stormy conditions, and can influence the appearance of the waters to seem filled with ships, likely representing a threat to maritime endeavors.

Beyond his control over the seas, Vepar also wields power over life and death, particularly concerning physical afflictions. He can cause individuals to die within three days by inflicting putrefying sores and wounds that breed worms. However, this power is not absolute; if commanded by a conjurer, Vepar is also capable of healing these very same ailments, demonstrating a dual nature of destruction and potential restoration. His depiction as a two-tailed mermaid further links him to the watery realm and the mysteries it holds.

Vepar's attestations are primarily found within grimoire traditions, most notably "The Lesser Key of Solomon" (Ars Goetia), a significant text in the study of demonology. While not extensively detailed in folklore or popular culture, his role as a Duke of Hell with specific dominion over the seas and human physical decay marks him as a distinct figure within the hierarchy of infernal beings.