D&D 5E Monk's Catch Missile Ability

[Tanaka Chris]

So... basically if a Monk can reduce the damage from a missile to 0 or less, the monk can catch the missile and throw it back as a monk weapon, with all relevant proficiencies and damage dice adjusting accordingly. i.e a dagger's d4 damage die could go up to d6, or even d10. and even if they were not proficient in a Longbow, can throw the arrow back with proficiency bonuses.

So here's my question.
What if the Arrow was magical? +1 modifier, with Cold/Fire damage stacked above the initial strike damage.
Does the damage dealt change to reflect the Monk's Martial Arts die? And keep the magic bonuses?

One step more mundane. Can a monk catch a flung flask of Alchemist Fire, throw it back (dealing impact damage) and also gain the benefit of the item's burning effect?

What do you guys think?

 

[Valmarius]

Magic arrows, I would absolutely keep any weird damage types and any +X bonus.

Thrown flask? I'm not so sure. The item entry says it shatters on impact...
I'd probably allow the Monk to catch it and throw it back, but the damage would be the typical 1d4 per turn. I don't think that being a powerful Monk should make the ongoing fire damage any worse.

 

[I'm A Banana]

Magic items are still magic and flasks still burst on impact, so I've got no issues with monks throwing back magic arrows and flasks. The damage from initial impact would be replaced by the monk damage (so the 1d8 from a magical arrow would be monk damage; the 0 from the impact of the flask would be monk damage), and fire or whatever on top of that would still count.