The Forbidden:

Beware of the ancient evil known as "The Forbidden". He is as intelligent as Beelzebub, faster than Satan, stronger than the Behemoth, older than the Leviathan, more prideful than Lilith, more amorous than Adrameleck, and more powerful than Lucifer.

Rumor from very rare sources say that it may have been The Forbidden who wrote many demon spell books, including the Necronomicon. The very books to summon imprisoned beings such as the Old Ones and Outer Gods. The books also hold powerful spells, some that would cost the summoner their life.

The books also hold a spell to summon The Forbidden if he is ever imprisoned.

The summoner is able to summon The Forbidden but are powerless in controlling him. In fact, he obeys no one regardless of who they are or if they want a deal.

The Forbidden defies all laws of physics and logic. He cares not for religious or non religious beings, for they are nothing but prey to him.

He cares not for any strength nor weapons, for he existed before many mortal weapons, even gods.

Only weapons created before his existence can harm or even destroy him. Only one exist but was lost through time.

Do not summon The Forbidden for if he returns, nothing can stop him.

If The Forbidden has been summoned, use the spell in any demonic books to seal him away once again.

If the books are unavailable, then do what you can to survive, for nothing can stop:

THE FORBIDDEN