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Imagine the following sequence of events:

  1. The wizard casts blink.
  2. During the next turn, he uses his Ready action to cast banishment on himself once he is in the Ethereal Plane.
  3. The banishment brings him back from the Ethereal into the Material Plane; since the Material Plane is his home plane, he can still maintain concentration on the spell.
  4. During his turn, he dismisses blink as an action, then breaks his concentration on banishment as a free action.
  5. This results in the wizard being returned to the Ethereal Plane, trapped there until he casts banishment again, and this time holds concentration for the duration of the spell.

Question: is there something wrong with this? Can you point out exactly why this wouldn’t work?

As you guys can see, these steps grant the caster an enhanced version of the spell etherealness, using a 3rd- and 4th-level spell slot, instead of the 7th-level spell slot required for etherealness.

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    \$\begingroup\$ Related on Can you choose to fail a saving throw? \$\endgroup\$ – NautArch Jul 14 '18 at 17:38
  • \$\begingroup\$ Also related Can you cast banishment on yourself? \$\endgroup\$ – enkryptor Jul 16 '18 at 11:32
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    \$\begingroup\$ I'm concerned that "Can you point out exactly why this won't work?" is code for "Please tell my DM to allow me to use this weird trick to hop into the Ethereal Plane at will." If you want your DM to allow something like this, having an airtight rules justification is far less important than not abusing the trick. \$\endgroup\$ – Mark Wells Jul 16 '18 at 15:37
  • \$\begingroup\$ It has already been answered that it would work; but visibility would be a problem. My DM is not so keen on folllwing strict rules, he is more concerned with fun gameplay and good role playing. \$\endgroup\$ – Heleno Paiva Jul 16 '18 at 15:47
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This should work

Let's go through step by step and I'll go through every requirement

Cast blink

As long as he has a 3rd level spell slot, a free hand, and can speak this is no problem for your wizard.

This means at the end of your turn there is a 50% chance that you will be on the Ethereal Plane until your next turn starts.

Readies banishment

To cast banishment and hold the magic (the crux of the Ready action for Cast a Spell), he will need something he distastes which should be fairly easy for your wizard to figure out. The trigger for the Ready action must be perceivable which entering the Ethereal Plane certainly is.

While on the Ethereal Plane, you can see and hear the plane you originated from, which is cast in shades of gray

Let's assume you rolled an 11 or higher on blink (if not you have to wait until next round for this plan to work). Banishment has a different effect depending on the plane the target is on. Since your wizard is on the Ethereal Plane due to the blink spell (reactions take effect after the trigger), and his native plane is the Material Plane, he will be transported back to the Material Plane until the spell ends as long as he fails the save.

You may be unable to willingly fail a saving throw in 5th edition and if your wizard succeeds, he will have to try again next turn with a new 4th level spell slot.

Cancels blink

All you need for this is an action, which you get on your next turn. Since you are already on the Material Plane, blink does nothing at the start of your turn. (emphasis mine)

At the start of your next turn, and when the spell ends if you are on the Ethereal Plane, you return to an unoccupied space of your choice that you can see within 10 feet of the space you vanished from.

Breaking concentration

There is no such thing as a "free action" in 5th edition, but ending concentration takes no effort on your part.

You can end concentration at any time (no action required).

When he ends his concentration (as long as he does so within 1 minute of casting the spell), banishment returns your wizard to the space he cast it from, on the Ethereal Plane.

If the spell ends before 1 minute has passed, the target reappears in the space it left or in the nearest unoccupied space if that space is occupied.

Low-level etherealness?

This isn't quite low-level etherealness since your return method of banishment has an undetermined destination whereas etherealness ends by returning you "in the spot you occupy. Banishment places you in an undisclosed location and as such, your GM decides.

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    \$\begingroup\$ Great job! I think you nailed it! Good points and well organized explanation. Thanks! \$\endgroup\$ – Heleno Paiva Jul 14 '18 at 20:20
  • \$\begingroup\$ @thedarkwanderer I fundamentally disagree with that answer. Here is the relevant line from the text: "You don't normally decide to make a saving throw, you are forced to make one because your character or monster is at risk of harm." The spell says you make a save, not that you "can". \$\endgroup\$ – David Coffron Jul 15 '18 at 21:18
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    \$\begingroup\$ @illustro there is no rules that the border ethereal still allows you to see the bordering plane. Certainly reasonable, but that's why I put "may no longer be able to see" \$\endgroup\$ – David Coffron Jul 15 '18 at 21:51
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    \$\begingroup\$ @Vigil I guess I missed that. Fixed \$\endgroup\$ – David Coffron Jul 16 '18 at 12:57
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    \$\begingroup\$ Note that if you ready banishment and don't blink you just wasted your spell slot. There will be a 50/50 every round that you won't trigger the readied spell and it will be lost. \$\endgroup\$ – Nick Brown Jul 16 '18 at 13:14
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Everything works as you've described

However, even though your idea works, it does not mean it works well, or that it is a replacement for Etherealness.

First of all, you expend your spellslot when you ready the spell, not when it triggers and that readied spell is wasted if you don't use it before your next turn. Moreover, you cannot choose to fail your banishment save.

So between blink-less turns and banishment saves, your chances of wasting 4th level spell slots is significant. For example, assuming you are a 7th level wizard with 18 int and 8 cha, on average you'll have to try (1/(.5*.75)) ≈ 2.67 times before succeeding. Each attempt expends your only 4th level spell slot.

The return trip is also a problem. You can use banishment to get back to the Material Plane, but where exactly you'll end up is entirely up to your DM. A 7th level character would be functionally retired for months or years as he/she travels from a random location on the Material Plane to the party's last known location.

By contrast, Etherealness is meant to facilitate travel and exploration. You can just walk (float?) past 8 hours worth of dangers or obstacles and then conveniently reappear at your new location. It's a completely different functionality compared to your idea, which permanently places you in the Ethereal Plane, with no convenient means of return.

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    \$\begingroup\$ Yes. you are right. It would perhaps be a good idea to use it as a downtime activity, entwined within some crazy plot.... but the again I’m convinced: it wound be an early game etherealness. That would be too crazy anyways. \$\endgroup\$ – Heleno Paiva Jul 14 '18 at 20:59
  • \$\begingroup\$ Why is your limit to etherealness travel 24 miles? Where do you get that distance? \$\endgroup\$ – David Coffron Jul 14 '18 at 22:52
  • \$\begingroup\$ 24 miles is the distance a party can travel in 8 hours at a normal pace. Now I changed it "8 hours worth of dangers", I hope it is more intuitive. \$\endgroup\$ – Ruse Jul 19 '18 at 3:26

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