The event log is located in the same window as the Daily Achievements.
It displays all things that happen while you're witching including:
- Spirit activity - when you summon a spirit and when any spirits cast a spell on you.
- Witch activity - when any witch, yourself included, casts any spells on you.
Why does it say my spirit "has turned against you"?
As far as I know, the healer spirit isn't taking energy from you (like the event log displays) since the positive energy amount of the healer spirit's Bless is the same as the "turned against negative energy amount".
- Whenever a spirit or witch actually attacks you, it'll display "Arcane Damage" or a name of an attack spell and damage amount.
Only when a spirit casts Dispel, it shows that the 0 energy damage, as it is not a damaging spell.
So why is it displayed like that?
So it's my opinion that it's displayed that way because it's the only way that the game developer (who wrote that code) to show how much energy a spirit have healed, or casted Dispel, on a witch.