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Official Terrarian
NOTICE: This is just a take on what I believe made ectoplasm and other features of Terraria come to be, this should not be regarded as must-be-canon, nor should anybody be attacked because of apposing or supporting it, please understand that this is just a head-canon, and yours may be completely different. You are allowed to use this headcanon in any other product. And I would love to see how this could be expanded, or even corrected.
Ectoplasm
Ectoplasm, a substance of energy that contaminated the world of Terraria with evil spirits that took form from it as long as even the beginning of eras. At the same time, serving as a tool so violent that the force of all ectoplasm combined could even take down a god, or so the myths said. It's power and energy is still present in Terraria today, which hadn't have been if it wasn't for the creation of the wretched dungeon constructed from a clique formed to serve the deceased leader, Cthulhu. It has been established that this substance exceeds most others, even rivaling the spirits of light and dark in power. As such, shall any Terrarian were to feel the presence of ectoplasm nearby, would they need to evacuate their current environment if it is felt nearby, as spiritual beings such as wisps and ghosts may have cursed their land. The only way to purify their land again is if they bear a material that contains stones that attract large masses of mystical energy, the two most powerful ones: granite.
Granite Energy
When the resurgence of ectoplasm went through the world of Terraria and beyond, it clashed with the new organic material formed after the beginning times of Terraria. After a while, it found its way to the depths of the world, adventuring through the caverns, until it found a special type of stone, granite, a rough igneous rock with high concentrations of quartz, but also bearing unusual power, perhaps from an interaction with ancient ectoplasm when the formation of granite was just starting, as many suspect. As all rocks, granite piled up and became compact, trapping leftover energy from ancient ectoplasmic matter. Ectoplasm was attracted to granite, as it is the type of matter that bonds together with others, forming their power. As such, ectoplasmic matter attached to granite, only building up the amount of power that the rock holds, leading to a chain reaction of ectoplasm heading towards granite filled caves, that was until marble regions and Lihzahrd temples manage to harvest energy from the substance as well, and converting them into their own power, and then the formation of dungeons, buildings that are formed from granite. As much of an impact they did on the attraction of ectoplasm to granite caves, it was still enough to lead to the creation of sentient beings of great power that roam around the caverns. However, there eventually came to a time where ectoplasm started growing weak, due to this, it was known as granite energy, and fell behind the other ectoplasmic forms in strength, including marble energy.
Use of ectoplasm
A majority of powerful mages wield ectoplasm and uses it as a weapon, others may harvest the souls of light and dark in their advantage, and only a few others practice with other powerful sources of magical energy such as Lihzahrd power. Ectoplasm can come in many weapons from spectre staffs to magnet spheres. As such, it is deemed a vital material to face off against the moon lord, however it falls behind the nebula fragments, but still is most used by sorcerers, as nebula fragments are rare and can only be harvestable if a nebula pillar is present in a lunar invasion. Ectoplasm could also be used to defend others, an example of such use is the Nazar, an amulet believed to protect the bearer from the evil eye. Ectoplasm is also used by the lunar cult, used to heal Cthulhu, but some stress that they used ectoplasm to seal Cthulhu, although, ectoplasm has the capability of both sealing and healing.
Ectoplasm
Ectoplasm, a substance of energy that contaminated the world of Terraria with evil spirits that took form from it as long as even the beginning of eras. At the same time, serving as a tool so violent that the force of all ectoplasm combined could even take down a god, or so the myths said. It's power and energy is still present in Terraria today, which hadn't have been if it wasn't for the creation of the wretched dungeon constructed from a clique formed to serve the deceased leader, Cthulhu. It has been established that this substance exceeds most others, even rivaling the spirits of light and dark in power. As such, shall any Terrarian were to feel the presence of ectoplasm nearby, would they need to evacuate their current environment if it is felt nearby, as spiritual beings such as wisps and ghosts may have cursed their land. The only way to purify their land again is if they bear a material that contains stones that attract large masses of mystical energy, the two most powerful ones: granite.
Granite Energy
When the resurgence of ectoplasm went through the world of Terraria and beyond, it clashed with the new organic material formed after the beginning times of Terraria. After a while, it found its way to the depths of the world, adventuring through the caverns, until it found a special type of stone, granite, a rough igneous rock with high concentrations of quartz, but also bearing unusual power, perhaps from an interaction with ancient ectoplasm when the formation of granite was just starting, as many suspect. As all rocks, granite piled up and became compact, trapping leftover energy from ancient ectoplasmic matter. Ectoplasm was attracted to granite, as it is the type of matter that bonds together with others, forming their power. As such, ectoplasmic matter attached to granite, only building up the amount of power that the rock holds, leading to a chain reaction of ectoplasm heading towards granite filled caves, that was until marble regions and Lihzahrd temples manage to harvest energy from the substance as well, and converting them into their own power, and then the formation of dungeons, buildings that are formed from granite. As much of an impact they did on the attraction of ectoplasm to granite caves, it was still enough to lead to the creation of sentient beings of great power that roam around the caverns. However, there eventually came to a time where ectoplasm started growing weak, due to this, it was known as granite energy, and fell behind the other ectoplasmic forms in strength, including marble energy.
Use of ectoplasm
A majority of powerful mages wield ectoplasm and uses it as a weapon, others may harvest the souls of light and dark in their advantage, and only a few others practice with other powerful sources of magical energy such as Lihzahrd power. Ectoplasm can come in many weapons from spectre staffs to magnet spheres. As such, it is deemed a vital material to face off against the moon lord, however it falls behind the nebula fragments, but still is most used by sorcerers, as nebula fragments are rare and can only be harvestable if a nebula pillar is present in a lunar invasion. Ectoplasm could also be used to defend others, an example of such use is the Nazar, an amulet believed to protect the bearer from the evil eye. Ectoplasm is also used by the lunar cult, used to heal Cthulhu, but some stress that they used ectoplasm to seal Cthulhu, although, ectoplasm has the capability of both sealing and healing.