Here's the situation:
The party rogue comes up against a rather nasty enemy (homebrew) that does 1d8 bludgeoning damage and 1d8 psychic damage on a melee attack. The bludgeoning damage drops her to 0 hitpoints, and then I roll the psychic damage. Does the psychic damage, which is part of the same attack, cause her to fail a death save? The rules say:
If you take any damage while you have 0 hit points, you suffer a death saving throw failure. If the damage is from a critical hit, you suffer two failures instead. If the damage equals or exceeds your hit point maximum, you suffer instant death.
Does this mean that the psychic damage, being "any damage" causes her to fail a death save? Or was this meant to be a per-attack basis? If the monster hit her again with the same attack, how many failures would she have?
At the time, I was thinking that she would be dead, but my players talked me out of it and I want to be sure before something similar happens again.
If it is one failure per damage roll, then I'm concerned about things like a dagger that does 1 slashing damage, 1 acid damage (from some being applied), and 1 fire damage (from being enchanted) flat out killing a character at 0 hp. It seems a little cheesy.