Demon Vepar is described in the Goetia and this is his seal.

Demon Vepar appears in the several old Occult sources: The Discoverie of Witchcraft, Goetia, Pseudomonarchia Daemonum and a few other books.

Below you will find several descriptions of Vepar and also some other useful information. Hopefully, this post will help you to summon Vepar.

Demon Vepar: Goetia

The 42nd spirit is Vepar. He is ranked as a duke and shows up in the form of a mermaid. Vepar is in charge of the waters and guides ships equipped with weapons.

At your request, Vepar will cause the seas to become stormy and to appear full of ships. Vepar can cause men to die in three days by putrefying wounds or sores. He can cause worms to bread in wounds and sores.

Vepar commands 29 legions of spirits.

Source: Goetia

Demon Vepar: Pseudomonarchia Daemonum

Vepar, also called Separ, is a duke and he is strong. He appears like a mermaid and he is the guide of the waters. Vepar guides ships equipped with weapons.

He can cause the seas to become stormy and also full of ships. Vepar kills men in three days by means of putrefying wounds and sores, producing infection in them. However, they may be all healed with effort.

Vepar rules 29 legions of spirits.

Source: Johann Weyer, Pseudomonarchia Daemonum

Vepar: Daemonolatry Goetia

This demon can help you to battle down chronic habits of negative thinking.

Source: Daemonolatry Goetia by S. Connolly

A similar and safe demon: Dantalion

If you want to heal a depression or chronic patterns of negative self-talk, self-criticism, deep seated fears or some other negative inner thought patterns, you might want to summon Dantalion from Goetia.

I suggest also to do freezer spells on yourself (with the aid of Dantalion). Dantalion can also help pets to heal their anxiety. Freezer spells with Dantalion and Heramael help pets to become very calm and happy.