Rabid Shadows (Potency Conduit) ( https://shadowlands.wowhead.com/spell=338338/rabid-shadows ) Your [ Mindbender][ Shadowfiend]'s attack speed is increased by 20%, and it deals 10.0% more damage.
Ranks: 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25

Modify SF/Mb incoming insanity prediction with increased attack speed.

This will be helpful: https://wow.gamepedia.com/API_C_Soulbinds.GetTree