i'm generally not really a music video person but i've been obsessed with these two for a while now. Fall From Grace has one of the most striking depictions of grief-driven delirium (? not sure if that's the right word) i've ever seen, and Godforsaken is fucking gorgeous all around, subliming the mood set in the music itself. (also it's in anamorphic format and i'm a huge slut for that)
Paradise Lost - Fall From Grace (cw for depiction of suicide)
Insomnium - Godforsaken