- Main article: Soul Gem (Oblivion)
Soul Gems are used for harvesting the souls of unsentient creatures and then binding them into the gem. This bound soul can then be used for enchanting Weapons and Armor, or other purposes of the arcane.
The Petty Soul Gem is the smallest Soul Gem, and it can only carry white souls of the "petty" category. When filled with the best applicable soul, their capacity utilized in enchanting is 150.