I noticed this a couple weeks back when I took my dark monk out to eGH, and confirmed it again in the last couple days.
What gives that Touch of Death doesn't register on eGH Giants? Is this WAI? Every giant I've tried it on is immune, but they're obviously not immune to negative energy damage from the other negative ki attacks, nor are they immune to Quivering Palm, but everytime I use ToD, they come up with a deathward symbol, even if they've never been deathwarded and I drop them with a subsequent Quivering Palm attack. Why are they immune, is it a bug?
This makes TOR runs, and frankly, any giant killing, extremely frustrating for a dark monk.