I'm about to run Out Of The Abyss for my players, which features drow as occasional opponents. All drow get to cast Faerie Fire and Darkness once per day. Faerie Fire is straightforward and easy to understand how I'll use: targets are lit up, can't possibly hide, and everyone gets advantage when attacking them. Great for sticking on the party thief, anyone with heavy armor, or anyone else.
But how am I supposed to use Darkness? It feels a bit like Fog Cloud (stick it on ranged opponents to make them waste time moving), but it has a smaller radius and that rather situational dispel-low-level-light-spells trick. The caster can't see through Darkness, but I can't see how it's anything other than an expensive Fog Cloud. Is there something I'm missing, or some better ways to use it?
The party consists of: Monk (Open Hand), Rogue (Assassin), Cleric, Warlock/Sorcerer, and Fighter. They're all 6th level.