Really low stings..
https://bit.ly/low-end-strings

This Kontakt library (yes can run on the free Kontat player) is all about dark and low textures of string sounds. Lowest playable octaves captured from a real string orchestra, heavily processed through modern and vintage gear Combine and blend between four instrument layers for hard-hitting depth Explore super-low hybrid strings, rumbling basses, and deep, modern organic pads.