Skein of Skophos

Wondrous item, uncommon (requires attunement)

Price: 800-1,000 gp | low sentimentality

This skein of yarn contains 1,000 feet of yarn coiled in a ball that fits in your hand and weighs 1 pound. You can unravel the coil to leave a trail of yarn behind you. As long as the yarn remains connected to the skein, the yarn is unyielding and can’t be moved except by you, the use of a wish spell, or divine intervention. If strung above the ground, creatures that move into the yarn must succeed a DC 10 Strength saving throw or fall prone. A segment of yarn can be cut or destroyed by suffering a cumulative 10 points of magical slashing, acid, fire, lightning, or necrotic damage, at which point all segments of yarn not connected to the skein become normal yarn with no magical properties. The yarn is immune to all other types of damage.

Paid

The yarn becomes invisible to everyone except you when you begin unraveling it. It becomes visible again once you ravel all connected segments back into the skein.

Overpaid

If strung above the ground, creatures that move into the yarn suffer 1d6 magical slashing damage.

Source: The Gray Merchant of Asphodel