Pain bar changes color based on pain value:
< 20 - RED
>= 20 - YELLOW
>= 40 - BLUE
>= 60 - GREEN
>= 90 - RED
You can find a preview of it here: https://gfycat.com/EarnestReliableGnatcatcher
This aura group contains auras for: Pain, Demon Spikes, Empower Wards, Sigils and Soul Cleave
Credits: Sunnier for the Soul Cleave calculation script