Please rework the Abyssal rare that applies a life-siphoning debuff (it feels like a bleed)

For the life of me, I don’t know what type of debuff this is, but it’s easily the biggest deal-breaker in this Abyssal league. I’m at 2,100 HP and have bleed immunity (2 charges). When I’m near that rare mob, my HP drops very fast—even while I’m drinking a flask—like a bleed-type effect. That mod also has bad scalability: it's even a deal-breaker at map tier 3, and it still is at map tier 10 (SSF).

Again, not asking for any nerfs, just a re-work, perhaps improve how the mod scales with lower level zones?