So, as I continue to level up, I find myself wanting to explore the crafting world a little more. However, as I continue to do so, I find myself lacking an excess amount of Subtle Essence, the basic crafting ingredient.

What is the most efficient way to farm Subtle Essence? I have found that every Blue item always dishes out 1 Subtle Essence. Is it worth creating a farming character for the low levels with high magic find, or do items at higher difficulties yield more Subtle Essences?