Patch notes said:
"Blood Magic
- Mechanic: Corruption
- Corruption deals gradually increasing damage the longer the caster stays above 90 Corruption. This can be see through the buff “Tainted Blood” in the player’s buff tray."
But I can’t see Tainted Blood buff in buff tray or even in invisible buffs.
The corruption damage seemed to increase in 3 steps, but monitoring stacks without the visible buff was a bit difficult.