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My Irithyll Straightsword +5 (frost) deals more damage to these guys than my Chaos Longsword +10 (fire.) I have the right attributes for each sword mentioned. -Mikko
Sometimes they will drag you down to beset you.

Floor Draggers:

https://www.youtube.com/watch?v=0qhaEycc7sE
If your HP goes to 0 with this grab, you will be fully dragged down underground, so the Murkmen will beset you more.