After testing the spell it works like this:
- Stacks with Mental Horror and Shroud of the Nightborn (which dont stack with each other).
- On the proc it does some damage and triggers the recourse; it does not provide mana like Mental Horror.
- The recourse lasts 2 ticks and heals you for 10% of your melee damage (only the first hit on a double or triple attack), except on the first swing, where the heal effect is higher.
So it is not an upgrade to Mental Hooror, but an alternative to our other selfbuff line, if we want manaprocs and more heal procs than TotC can provide.