While on the ethereal plane, What does the caster see?
- Through fog?
- Through darkness?
- Through walls?
- Invisible creatures?
The blink spell states that the caster will have 60ft of sight in shades of gray of the material plane.
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Appendix C of the Player's Handbook (or the basic rules) says under the "Transitive Planes" heading that some spells allow you to see into the Ethereal Plane:
Its shores, called the Border Ethereal, overlap the Material Plane and the Inner Planes, so that every location on those planes has a corresponding location on the Ethereal Plane. Certain creatures can see into the Border Ethereal, and the see invisibility and true seeing spell grant that ability.
The see invisibility spell allows you to see into the Ethereal Plane. But any other ability to see into the Ethereal Plane (or vice versa), does NOT give you all the effects of the see invisibility spell.
The see invisibility spell description explicitly says it gives you two different abilities — to see invisible things AND see into the Ethereal Plane:
For the duration, you see invisible creatures and objects as if they were visible, and you can see into the Ethereal Plane.
Since spells do only what they say they do, the Blink spell gives you an ability to see the Material Plane from the Ethereal Plane, nothing more. It does NOT give you the other effect of the see invisibility spell.
So you simply can see all the Material Plane — terrain, objects (including walls) and creatures. The blink ability imposes two restrictions though:
Beyond that, you use your own sight. That means all other restrictions of your own sight are still there:
The blink spell does not give you an ability to see invisible creatures, or see through walls. You will neither see through walls, nor invisible things, unless you already were able do that before casting blink.
The blink spell makes you "vanish from your current plane of existence and appear in the Ethereal Plane". It also says that you "can see and hear the plane you originated from". Since it doesn't say "can see only the plane you originated from", I assume you can see the Ethereal Plane as well, including creatures from this plane.
However, you can't look farther than 60 feet in Ethereal Plane (see DMG page 48, under the "Ethereal Plane" heading):
Visibility in the Border Ethereal is limited to 60 feet