@JeremyECrawford Does Mind Blank spell protect from all the effects of Feeblemind spell (damage + ability scores reduction) or just from its damage?

— Draconis (@DerynDraconis) January 23, 2019

The mind blank spell is meant to protect you entirely from the feeblemind spell. #DnD https://t.co/LkKyp7zetP

— Jeremy Crawford (@JeremyECrawford) February 1, 2019

Ranger-Hunter; Multiattack feature. It’s one attack with multiple targets and multiple attack rolls. How does it work with spells with “The next time you hit a creature with a weapon attack before this spell ends” (like Ensnaring Strike)? Choose one? (1/2) What about Absorb Elements? "Also, the first time you hit with a melee attack on your next turn, the target takes an extra 1d6 damage of the triggering type, and the spell ends." Additional damage to all? (2/2)

— kentusrpg (@kentusrpg) November 2, 2018

In D&D, attack rolls are assumed to be sequential, rather than simultaneous, unless a rule tells you otherwise.

If your DM prefers the attack rolls of your Volley/Whirlwind Attack to be simultaneous, choose the creature affected by ensnaring strike from among those hit. #DnD https://t.co/G2iRNsCq67

— Jeremy Crawford (@JeremyECrawford) February 1, 2019

@JeremyECrawford
1) If a caster casts a spell, and the target successful pass his saving throw, does the caster immediately knows that the target makes his save successfully?
2) Does a spellcaster knows even without seeing when the effect of his concentration spell ends?

— Draconis (@DerynDraconis) January 28, 2019

A spellcaster doesn't automatically know whether a spell's target succeeded on a saving throw against the spell, but with most spells, the effects are perceivable on the target. #DnD https://t.co/B4HHWJTMQr

— Jeremy Crawford (@JeremyECrawford) January 30, 2019

Thanks @JeremyECrawford!
And does a spellcaster knows (even without seeing) when the effect of his concentration spell ends?
ie: If I cast the Invisibility spell on the Rogue that goes alone inside a palace to kill his victim. When he attacks I feel that the effect of spell ends?

— Draconis (@DerynDraconis) January 30, 2019

If you're concentrating on a spell, you know when that spell ends, whether you end your concentration willingly, your concentration is broken, or the spell ends in some other way. #DnD https://t.co/sQgmU1hlCQ

— Jeremy Crawford (@JeremyECrawford) January 30, 2019

Hi Jeremy, how about with Zone of Truth? With no obvious visual/sensory indicators, it sounds like the caster might not know if the spell took hold, meaning they can't tell if the targets are being truthful? And if they can't, does that make the spell kind of pointless?

— Rades (@_Rades) January 30, 2019

Zone of truth: "You know whether each creature succeeds or fails on its saving throw" (PH, 289). #DnD #TheRulesTellNoLies https://t.co/t4kdVtQKf6

— Jeremy Crawford (@JeremyECrawford) January 30, 2019

When I face down a zone of truth, I plan on telling my truth in dance! They'll both know that I'm telling the truth, and not know what I mean. My hopes? Lead to a whole new school of art in Waterdeep in a hundred year quest to understand my answer!

— Kymlaar'Hehim (@kymlaar2) January 30, 2019

Tell the truth with … dance! 💃🕺 https://t.co/4aX9OvcpY1

— Jeremy Crawford (@JeremyECrawford) January 30, 2019