Ok, so how does this spell work if it's cast while you're on an outer plane. In the DMG it explains the ethereal blade borders all the inner planes, and the Astral sea borders all the outer.

Example: player currently in avernus (1st layer of the nine hell plane) casts blink. What happens? Spell as it is written doesn't fail, but the ethereal doesn't border the nine hells so how are you able to see and hear things back on avernus?

i cant find an answer for this so hoping you guys  can offer a explanation. 

I understand critters can zap in and out of th Ethereal plane and if a PC is there because of "Blink" the monster can attack and damage the player.

But can the Ethereal plane or any part of it become corrupted? and or so corrupted you take damage for using blink?

Any thoughts most helpfull Thanks in advance. 

Could this spell feasibly be used for stealth? Not being present for 50% of the time (and that time not having any effect on your usual movement) sounds pretty fantastic for not being seen, or if you are casually spotted, not being there when they go to investigate. 

Quote from DMSunshineRed >>

Ok, so how does this spell work if it's cast while you're on an outer plane. In the DMG it explains the ethereal blade borders all the inner planes, and the Astral sea borders all the outer.

Example: player currently in avernus (1st layer of the nine hell plane) casts blink. What happens? Spell as it is written doesn't fail, but the ethereal doesn't border the nine hells so how are you able to see and hear things back on avernus?

 My understanding of the Ethereal Plane is that it's the border between the inner and outer planes, and beyond the outer planes is the Astral Sea. So the universe is like an onion: it has layers. 

I would want to know if you can make the somatic gestures involved, as well.

Quote from A_Warlock_Named_Briken >>

Can a spellcaster ready the dash action for when blink takes them into the ethereal plane, then move (up to their walking speed) there? The spell's description states that "you return to an unoccupied space of your choice that you can see within 10 feet of the space you vanished from" but you can stand next to the wall, blink to the etheral plane, move through the wall's space so that you can see an unoccupied space behind it, and reappear at the beginning of your next turn.

It would allow you to go through any wall, floor or ceiling less than 10 feet wide. You could also just traverse back and forth through a wall to spy creatures on the other side.

So can you actually move freely through the portion of the etheral plane that this spell sends you to? This would require at least two actions but still feels a bit overpowered for a third-level spell slot, especially since you still get the benefit of blink for the rest of the duration.

On a related note, can someone ready their action to drop  an object in the etheral plane? You could hide a McGuffin, weapons, valuables or the object that you want to steal, and retrieve them  later. Any thoughts?

 

 This is great! I'm going to try this with my wizard.

Grapple reduces a creature's speed to 0, but it can escape the grapple by movement conducted by an outside source or by teleportation.

Restrained does the same, except the target has disadvantage on attack rolls while an enemy would have advantage, and the target has disadvantage on Dexterity Saves.

Neither Grapple or Restrain stop a spellcasters somatic components through RAW or RAI rulings.  You can homebrew to change that, but that is a change that should be brought to your party's attention first instead of randomly arbitrating a restriction in the middle of combat out of the blue.

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Can you use "blink" to get out of being restrained???

 I'd say no, cause if you were able to do so, then i would subsequently rule that you drop any weapons, armor, or anything else on your person. 

Why would you rule that? It doesn't make any sense, and also it's much easier to just rule that you can't perform the somatic component when restrained

How would you rule a sorcerer using this subtly to escape the restraints? 

 That they succeed in the same way they would if they cast Misty Step instead

 Correct me if I'm wrong, but isn't that what the freedom of movement is for?

 don't know about anyone else, but I always let teleportation spells be cast by restrained creatures, as I would anyother spell

 My guys, everyone is going about this the wrong way. Clearly the right answer is to use smart npcs and ignorant npcs, where at first you introduce the ignorant ones who throw regular restraints on a caster and expect it to work, only for the caster to get their cool moment of slipping the restraints via a teleportation spell. Then you introduce the smart npcs who apply magical restraints to casters, making it impossible for them to move their hands in such a way that allows for magic and acting as mini anti-magic fields that nullify a casters magical capabilities all together. The best way to fix casters isn't to nerf casters, it's to buff the rest of your world, that way your heroes don't feel any less cool and the world only feels cooler.

Can you maintain concentration on Haste while on the ethereal plane due to a Blink spell?

Yes

You'd still have to do the somatic components, but if your arms are free i'd say yes

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Can you use "blink" to get out of being restrained???

 I'd say no, cause if you were able to do so, then i would subsequently rule that you drop any weapons, armor, or anything else on your person. 

Why would you rule that? It doesn't make any sense, and also it's much easier to just rule that you can't perform the somatic component when restrained

How would you rule a sorcerer using this subtly to escape the restraints? 

 That they succeed in the same way they would if they cast Misty Step instead

 Correct me if I'm wrong, but isn't that what the freedom of movement is for?

 A sorcerer with access to BLINK probably doesn’t have access to FREEDOM OF MOVEMENT. 

Quote from skeletonducky >>

The spell is ruled in a way that makes it hard to move while ethereal. You become ethereal at the end of your turn, and re-enter the material plane at the start of your next turn. This means you are never ethereal during a time you can move. The only way you can move from your current spot while ethereal is if something on the ethereal plane moves you before the start of your next turn, which is difficult, as most naturally ethereal creatures suffer from low strength scores.

However, if you do want to use this to pahse through things, remember You return to an unoccupied space of your choice that you can see within 10 feet of the space you vanished from. Which means so long as you can see (i.e. through a window or something) a space, you can teleport to there.

Overall, the ruling of the spell makes it work really nicely as a protection spell, which is how it was intended, allowing you a 50% chance to blink away from danger before reappearing. And for those new to the spell, don't forget the 10 ft. teleportation before you reappear! Use it to avoid readied melee attacks by patient monsters waiting for you to reappear.

(note: the sorcerer in a game I DM rolls insanely for this, and has a habit of becoming ethereal every turn. Is their go-to defensive spell).

 
in sharp contrast to my sorcerer, who can NEVER get this spell to pop off! lol 

You stick to a wall or door, disappear and then reappear on the other side

a 50% chance to be untargetable by anything (unless it has truesight) available at 5th level AND no concentration required? This spell is easily S-tier.

not even if it has truesight because regardless of if you can see someone ethereal, you still can't reach them. amazing spell.

So, for 10 turns, at the end of my turn, I roll a d20 and I have a 50% chance to vanish to the Ethereal Plane, where I can still see and hear 60ft around me but since it's not my turn, there's no actions for me to take (not even held actions?)? Then at the start of each of my next turns for the duration of the spell, if I were in the Ethereal Plane, I return, take my turn, then roll again, and repeat until the duration of the spell ends?

Quote from thechrjs >>

So, for 10 turns, at the end of my turn, I roll a d20 and I have a 50% chance to vanish to the Ethereal Plane, where I can still see and hear 60ft around me but since it's not my turn, there's no actions for me to take (not even held actions?)? Then at the start of each of my next turns for the duration of the spell, if I were in the Ethereal Plane, I return, take my turn, then roll again, and repeat until the duration of the spell ends?

Exactly correct.

If you're wondering what the point of this is, it's that it gives you a 50% chance of spending the whole round outside of your turn largely invulnerable to almost anything that could hurt you.

how can a druid get this spell