After extensive playing time and many alchemy levels later, here are the ingredients in my opinion that are the hardest to find.
1. The hardest to find for me has to be Spriggan Sap, here's why:
A. If you do come across a group of Spriggans they only come in a group of 2 or 3.
B. In that group majority of the time, they only drop taproot.
C. They are not found in stores very often, only once in a while.
D. Spriggan Sap is important to me because it is a main ingredient in making fortify blacksmith potions.
2. Dwarven Oil: Only found in Dwemer ruins, hard for low level characters to make it through.
3. Hawk Beak & Feathers: Occasionally you find these in stores, but not often. Out in the wild they are extremely hard to find and may be one of the ingredients you get all the effects for last.
4. Pearl: Extremely hard to find! I've found them below docks in the water but that was only a couple of times. Not sure where the predominant area is for these.
5. Human Flesh & Heart: Can be found on dark mages, Falmer, evil characters. Every time I have found these, they have been inside a fort or cave. You will never find more than 1 per location making this item very rare.
6. Jarrin Root: Only given during the dark brotherhood quest involving the emperor. This item has to shown to do up to 800+ damage.
7. Large and small antlers: If you don't mind killing innocent deer and elk they are easy to come by. Finding them in stores are rare.
8. Powdered Mammoth Tusk: The Wiki shows that it can be located in Giant camps but I have never found it there.
9. Whisp Wrappings: These are not in stores and can be found high up in the mountains. Not recommended for low level characters.
10. Chicken Eggs: if you are having a hard time finding these, they are located in smaller villages under little tents that are chicken roosts. If you see a chicken nearby, the nest is not far away. Also rarely found in stores.
*What are the hardest ingredients for you to find in your opinion?
1.) You do not need
Spriggan Sap to make smithing potions. There are two other and more common ingredients with the effect on. (
Blisterword and
Glowing Mushroom)
2.)
Dwarven Oil: Rare, but not that rare and the effects are not very interesting. You can ignore it.
3.)
Hawk feathers & beaks: Rare, but you have not lived if you have not tried shooting hawks! See Solitude and the harbour area for hawks if you want to shoot some. You will have plenty of these ingredients after that.
4.)
Pearls are indeed very rare. They may have been overused in Oblivion is what I am thinking. (Or was it Morrowind?). There were too many of them in the past that I could say that I am missing them now.
5.)
Human hearts & flesh. Agreed, these are rare, too. I remember seeing those however quite often throughout Morrowind and do not miss them now.
6.)
Jarrin Root. It is a special ingredient and therefore it svcks. It has no place but in the minds of geeks. Use a
River Betty, it is a good and commonly found poison amplifier. You find this fish in many lakes and rivers. if you see dragonflies over the water then you will have a good chance of finding one.
7.)
Antlers are somewhat rare, agreed. Even when one goes hunting does it take a while to get a good stock of them.
8.)
Powered Mammoth Tusk is another one of those special ingredients, I think. I have found it, but I have no idea what to use it for. It is of no meaning to my game, but sits in a chest as a trophy until I know what it is needed for.
9.)
Whisp Wrapping, agreed, are rare just as the whisp mothers themselves.
10.)
Chicken Eggs can be found in villages as you say and can be bought in shops, too. They are rare for an ingredient but not by much. They should have been just food. Chicken eggs are a quite common food source I would say.
Rule of thumb: the harder an ingredient is to find, the less useful it becomes. The effort in finding them does not make up for what can be gained by them.
My favourite ingredient, though I have no real use for it anymore, is the
Canis Root. It is light-brown in colour and is very easily missed. One can stand in front of it and not see it. It took me a while until I figured out its pattern. They like to sit in a crack of a commonly found land formation in the Rift! Trying to find them in the marsh below Solitude is a real tough challenge. If you ever get bored, then try to find them there.