Spirit of Scorpius

The Spirit of Scorpius is a non-player character located in the Grave of Scorpius to the north of the Observatory. He is a follower of Zamorak. A brief story about him can be read in the Astrology Book which spawns inside the Observatory.

Post-Quest
After the Observatory Quest, he will give the player an Unholy Symbol mould. This may be used to make an Unholy Symbol of Zamorak, which the Spirit of Scorpius will offer to bless.

Astrology Book explanation
The Astrology Book's in-game text

Synopsis
The Astrology Book tells the story of Scorpius, who was a well educated man known for his visions and skills in magic. Seeking to communicate with the gods of the world, he studied for many years and developed a magical machine. This machine was essentially a telescope which could see into the heavens and realms of the gods. Scorpius mapped the stars for many years, using his findings to "gain dark knowledge" and predict the future. After he died, the blueprints for his magic telescope were found at a Zamorakian site of worship. The book also details how the legends of his ghost roaming the area persist to this day, and that he will grant a blessing of power to those whom are worthy.