Ok, I just got little samples of all four of the "Dark Elemental" scents, and I'll review Undertow first.
In the bottle, it smelled like.. berries? Maybe the lavender and mint combo made it smell like that to me. Pleasant. It's nice and fresh smelling.
A few hours on, I get the smell of a candle that's been just put out? A pleasant waxy scent? I like it. A definite keeper overall.