You are hit by a Specter’s Life Drain for 10 damage. You have 8 temporary hit points. Is your Max HP lowered by 2 or by 10?

You are hit by a Specter’s Life Drain for 10 damage. You have 8 temporary hit points. Is your Max HP lowered by 2 or by 10? By 10

— Jeremy Crawford (@JeremyECrawford) January 15, 2018

Does an Unseen Servant have a mouth?

— Francis Victor Calo (@BleedsChocolate) December 19, 2017

An unseen servant is "an invisible, mindless, shapeless force" (from the spell). It's not a creature. #DnD https://t.co/1ZNgKZV38Y

— Jeremy Crawford (@JeremyECrawford) December 20, 2017

If it is not a creature, nor an object but a “force” why the specifics of the AC and hit points.. since most effects in the game damage creatures or objects only? It’s exceptional. Spells are tricksy that way.

— Jeremy Crawford (@JeremyECrawford) December 20, 2017

@JeremyECrawford Sword of sharpness: does the additional 4d6 slashing damage when you roll a natural 20 double on a crit?

— DanDanFielding (@DMdandanfieldng) January 5, 2018

The sword of sharpness deals an extra 14 slashing damage when you roll a 20 on its attack roll. The SRD incorrectly says otherwise. Note that the SRD is not an official rules source for D&D. #DnD https://t.co/zoQqtgamzv

— Jeremy Crawford (@JeremyECrawford) January 5, 2018

@JeremyECrawford If a player with the Dueling fighting style uses the Sweeping Attack maneuver, does he add the +2 from dueling (or any bonuses from the weapon being magical) to the damage roll against the second target?

— Kellen Landry (@KellenLandry) January 5, 2018

The damage of Sweeping Attack is determined by the roll of your superiority die. The damage is increased only if you are benefiting from an effect that increases all your damage rolls. Effects that benefit only damage rolls with weapons have no effect here. #DnD https://t.co/pBJALTDKkF

— Jeremy Crawford (@JeremyECrawford) January 5, 2018

@JeremyECrawford Can Boots of Speed increase your swim or climb movement, or just walking only? Not talking about a Swim _Speed_, just base walking Speed used for swimming

— keithcurtis (@keithcurtis) December 12, 2017

If you lack a swimming/climbing speed, you use your current walking speed to swim/climb but must spend extra movement. The swimming/climbing rules don't shut off increases to your walking speed. #DnD https://t.co/QYkbOO5GvD

— Jeremy Crawford (@JeremyECrawford) December 12, 2017

What about for creatures with climbing speeds? If a Tabaxi wears Boots of Speed, does their climbing speed increase as well?

— Sol K (@SollyDoodle) December 12, 2017

Boots of speed increase your walking speed, not any other speed you might have. #DnD https://t.co/rTDIeaD9gH

— Jeremy Crawford (@JeremyECrawford) December 12, 2017

@JeremyECrawford
Thank you for your hard work. I just happened to learn you kindly answer to players question on D&D 5e rules, so i am here to ask you mine; i don't know if you already answered this question in the past, i apologize if it's the case.I don’t even know how to tweet properly,
so i do a screenshot… Shame on me. I
can be a high level mage, this doesn’t
mean i am proficient in Twitter…
Let’s come to the topic (it’s a thought,
more than a question):
I noticed attack cantrips evolve, otnher
cantrips don’t. I understand that a higher
level mage (or other classes) has MORE
cantrips, but a 20 level mage minor
illusion is the same of a first level
newbie. Fire bolt grows in power,
message doesn’t allow comunication at
a longer distance. Shocking grasp is
more dangerous level to level, while
mending is the same in every single
trait.
Some feats give possibilities to learn
other cantrips, but only attack ones
“evolve”.
I think it could be developed in a little
more “fair” way, enhancing some traits
of the other cantrips too.
Thank you for your attention.
 pic.twitter.com/ABFdeiPerI

— Fulcrus De Murv (@FMurv) November 29, 2017

Most non-damaging cantrips are just as good at level 20 as they are at level 1, whereas a damaging cantrip would become obsolete if it didn't increase in power. That's why damaging cantrips get better. #DnD https://t.co/LsiIB6VrHZ

— Jeremy Crawford (@JeremyECrawford) November 29, 2017

To be fair, “just as good” doesn’t mean “just as comparable impressive.” Makes sense that a 20th level Mage Hand could lift more than a 1st level mage hand; utility wise might be fine, but narrative wise could be questionable. The damage increase isn't meant to make the damaging cantrips more impressive. It keeps them relevant. Maintaining relevance is the design goal for cantrips. Want to lift more than mage hand can lift? Use telekinesis.

— Jeremy Crawford (@JeremyECrawford) November 29, 2017