Essence

1. The basic, real, and invariable nature of a thing or its significant individual feature or features.
2. A substance obtained from a plant, drug, or the like, by distillation, infusion, etc., and containing its characteristic properties in concentrated form.
3. A perfume; scent.
4. The inward nature, true substance, or constitution of anything, as opposed to what is accidental, phenomenal, illusory, etc.
5. A song by Enslaved, a black/viking metal band with progressive rock influences.