The Killing Winds (COA)

This spell causes the skies to darken and summons near-hurricane force winds that buffet targets with wraith-like shades that weaken and drain energy.  The caster selects a point that they can see; until the start of their next turn, all living things within a 5-mile radius suffer 8d12 points of necrotic damage (Constitution save for half damage) as their life force is drained from their body by the dark shades.  Anything killed by these winds turns into a desiccated, skeletal husk.  The force of the winds kicks up and dust, sand, or dirt, making the 5-mile wide storm an area that is considered Lightly Obscured (disadvantage on Wisdom (perception) saves that rely on sight).