When a demon grub devoured others of its kind and evolved into a Dretch, a name formed within its soul. That was its true name. A demon's original true name was very short, perhaps only a single name, but as the demon grew, that name became longer and longer.
By the time they became Abyssal overlords, their names might contain thousands of words. At the same time, every demon chose one or two parts from their true name as their own name.
After all, demons had no parents. They could only name themselves.
Take Demogorgon, for instance. His name was merely a fragment of his lengthy true name.
True names possessed magical power. For example, the name Demogorgon carried power. Within his own domain, if someone spoke that name, Demogorgon would immediately sense it. Through the feedback from his true name, he could obtain information about the person who had spoken it, along with some basic details.
On other planes, it was not nearly so effective, but if someone called his name with all their heart, Demogorgon might still take notice. Generally speaking, though, Demogorgon would not bother with people calling out to him for no reason. There was one exception: rituals. Rituals could amplify the power of invoking a true name.
Other demons were more or less the same.
Demons like Sanguinius, who had been created, were somewhat special. They were not born naturally, but created by others. Therefore, the first part of their true name was bestowed by their creator. Only when the creator gave them a name could they be considered complete demons.
When Sanguinius accepted that name, the Abyss began to acknowledge him as well.
The power of the Abyss began to gather!
Sanguinius's strength began to rise steadily, reaching legendary rank in no time before