The Amulet of the Black Skull from Tomb of Annihilation says:

You can use an action to expend 1 of its charges to transport yourself and anything you are wearing or carrying to a location within 100 feet of you. The destination you choose doesn’t need to be in your line of sight, but it must be familiar to you (in other words, a place you have seen or visited), and it must be on the same plane of existence as you.

Why does the description specifically prohibit intraplanar travel when it already specified that the location must be within 100 feet of you?

Are there any situations when this is definitively not a redundancy?

I’ve never played Tomb of Annihilation, is there an adventure specific circumstance I’m not aware of that makes both restrictions necessary in the descriptions?


Distances between planes are ill-defined in D&D 5e

As I cover in this answer, the rules do not clearly spell out how to compute the distance between two points on different planes. However, there are several places where the rules appear to assume that such a definition exists, such as the Wand of Enemy Detection (emphasis added):

For the next minute, you know the direction of the nearest creature hostile to you within 60 feet, but not its distance from you. The wand can sense the presence of hostile creatures that are ethereal, invisible, disguised, or hidden, as well as those in plain sight.

There would be no reason to mention detecting enemies within 60 feet on another plane if distances between the material and Border Ethereal were undefined, and yet a definition for inter-planar distance is never provided by the rules.

There are several other places in the core rules that mention something like this, and it seems that the passage quoted in the question is another such example. Explicitly disallowing planar travel entirely sidesteps the issue of whether inter-planar distances are defined.

  • \$\begingroup\$ +1. Just a little question / suggestion, in older editions tgere were places where you could just walk to another plane. If it is still the case it adds up to the distance issue. But is it? \$\endgroup\$
    – Mołot
    Jun 20 '20 at 8:00
  • \$\begingroup\$ @Mołot If you're looking through a literal portal to another plane, the same issue applies: distance between points in different planes isn't really defined. \$\endgroup\$ Jun 20 '20 at 14:45

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