Morrowind:Daedra's Heart

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Daedra's Heart (ingred_daedras_heart_01)
	200		1.0
Alchemy Effects
1st	Restore Magicka
2nd	Fortify Endurance
3rd	Drain Agility
4th	Night-Eye
Sources
# Samples	16 (+4 cursed)
Creature	Clannfear, Daedroth, Dremora, Golden Saint, Hunger, Ogrim	%	60

Daedra's Heart sample

"A daedra's heart must be removed during the brief period of its appearance on the mortal plane. The daedra's heart has modest magical properties, but, since removing the heart is generally fatal to the specimen, the substance is rare and expensive."

Daedra's Hearts are found on the bodies of most Daedra (except Atronachs). You can also harvest them from summoned Dremora, provided you're quick enough to check their corpse immediately after killing them but before they disappear. (Other summoned Daedra do not have Hearts.)

There is a special variety of Daedra's Heart, ID: ingred_cursed_daedras_heart_01, which can be found in many Daedric Shrines. Beware though, because these are cursed, and will cause a Dremora Lord to appear behind you and attack when you pick them up. This is a blessing, however, if you are after Daedra's Hearts, because that Dremora Lord will have yet another Daedra's Heart to give you. And these cursed Hearts can be used over and over again, for an easy, unlimited supply of Daedra's Hearts, provided you have no trouble fighting Daedra Lords. Cursed Hearts will not stack with regular Hearts, and can be combined with them to create a potion with all four effects. They are in limited supply, however, unlike the non-cursed variety, so you might want to keep them around instead.

Three other unique hearts are added by the Bloodmoon expansion. While they are not in any way associated with Daedra, they are identical in appearance and effects. (Their weights and values vary.) They are all needed for various quests, and so should not be used for alchemical purposes. They are:

Heart of an Innocent (ID: ingred_innocent_heart)
Heart of the Udyrfrykte (ID: ingred_udyfrykte_heart)
Heart of the Wolf (ID: ingred_wolf_heart )

You will need to offer one (non-cursed) Daedra's Heart to Malacath during the Malacath of the House of Troubles quest for the Tribunal Temple.

For a safer (but more expensive) way to stock up, the following vendors carry restocking supplies:

Loose samples (non-cursed):