I would've thought 'sad' and 'slow' are qualities of specific songs, not bands in general.....? Surely that gets very repetitive? That being said, I don't usually understand what most '-core' genres actually are.
Anyhoo, thinking along the lines of 'sad' and 'slow':
Opeth can be a bit morbid, particularly with Mikael Åkerfeldt's melancholy voice singing over hauntingly beautiful soundscapes.
Anathema's songs tend to have a theme of loss, depression, and desperation
Alice in Chains are a classic grunge band, some very dark music, especially as a lot of it centres around addiction, suicide, & depression
Porcupine Tree are another prog band, their songs are often about the negative side of life
That'll do for now cos I'm probably on the wrong track altogether
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