†Ectoplasm in Elder Scrolls Online is not an alchemical ingredient, but only valuable as loot to be sold for gold.
Ectoplasm is a filmy residue with modest magical properties that remains after a ghost, or spirit has been banished from the mortal plane. Garments made of ectoplasm are lightweight, frigid, and useful for keeping smiths from suffering heat exhaustion.[1]
†Emeralds in Oblivion are not alchemical ingredients, but only valuable as loot to be sold for gold. ‡Emeralds in Skyrim are also not used in alchemy, but can be used to craft jewelry. *In Elder Scrolls Online, Emeralds are use in crafting, but not alchemy. ^ In Blades, Emeralds are used for tempering gear or crafting jewelry, not in alchemy.
Emeralds are a rare transparent green gem with modest magical properties.
Emperor Parasol Moss can often be found hanging from Emperor Parasol mushrooms native to Morrowind. Moss hanging from the Emperor Parasols on Solstheim is known to be used in alchemy.