[RPG] What exactly is considered “light activity” for the purpose of the “Aspect of the Moon” Eldritch Invocation


Xanathar's Guide to Everything (p. 56) adds Aspect of the Moon as an option for one of their Eldritch Invocations:

Aspect of the Moon

Prerequisite: Pact of the Tome feature

You no longer need to sleep and can't be forced to sleep by any means. To gain the benefits of a long rest, you can spend all 8 hours doing light activity, such as reading your Book of Shadows and keeping watch.

What exactly is considered "light activity" for the purpose of this invocation? For example, would casting a spell, casting a ritual, making a short rest, copying spells and/or using a tool be considered light activity?

Best Answer

From the 5e SRD rules on resting (p. 87) one can find the definition of light activity (emphasis mine):

A long rest is a period of extended downtime, at least 8 hours long, during which a character sleeps or performs light activity: reading, talking, eating, or standing watch for no more than 2 hours.

By contrast, strenuous activity is defined right after:

If the rest is interrupted by a period of strenuous activity—at least 1 hour of walking, fighting, casting spells, or similar adventuring activity—the characters must begin the rest again to gain any benefit from it.

This means that this feature is effectively changing the usually required 6 hours of sleep and 2 hours of light activity (as indicated in errata, see this related Q/A), allowing you to spend all 8 hours doing light activity instead.

The light/strenuous activity distinction is not changed so the quoted definitions should apply as normal.