When catching an arrow tipped with poison (like the ones used by yuan-ti) with an ability like the one the monk has or the one given by arrow catching gloves: does the ability reduce the poison damage? If so, is the total damage or the piercing one caused by the arrow only the damage that must be downed to 0 to catch the missile?
[RPG] Catching poisoned arrows
dnd-5epoisonranged-attack
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Best Answer
So, I'm not going to pretend it makes sense, but as far as RAW is concerned, you reduce the poison damage too, and you have to reduce the total damage to 0 in order to catch the arrow.
Deflect Missiles looks like this:
Deflect Missiles says that the damage you take from "the attack" is reduced. And the Yuan-ti's attack looks like this:
"The attack" means the whole attack, not some subset of the attack or just the weapon damage section of the attack. So Deflect Missiles will reduce the total damage you take from the attack, and you'll have to reduce the total damage of the attack to 0 in order to catch the arrow.
Like everything in D&D 5e, this is open to DM rulings in the name of realism, fun, or sanity. Personally, I'd think long and hard before I changed the way this works, though; depending on how you rule this you might end up making Monks immune to Rogues.