There's a lot who claim xur to not be rng but I think he is; however, if he were to sell red death tomorrow I might think different.
A guarantee of health when hard mode offers no way to regen? There's something there.
This is only furthered if while selling red death he sells one or more of the following:
Third man
Skull fort
Apotheosis veil
To a lesser degree
Stand asides
Don't tug me
I don't know of any other warlock tertiary heal oriented gear.
That would just be too coincidental for me to go, yea that's random.
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Im calling truth.. I just saw 3 people get it in crucible