Thing In Your Shoe That You Can't Find Poking Your Feet

You place a cruel curse on a creature that you can see within range. The target is forced to use a slow travel speed (per the section on "Travel Pace" in the Player’s Handbook) for 24 hours or until their next long rest unless the target uses a mount or other mode of transportation other than by foot. The target is unable to perform any other activity while travelling (per the section on "Activity While Traveling]" in the Player’s Handbook) as it spends much of its time and attention adjusting and inspecting its footwear or feet.

When the spell is cast and for every 2 miles traveled by foot after, roll a d100. The target has a cumulative 15% chance to develop a painful blister that reduces its movement speed by 5 feet unless they are treated with a successful DC10 Medicine check or receive any amount of magical healing. A Construct, Elemental, Undead, or a creature that does not have skin or feet is immune to this effect.  A creature's speed cannot be reduced below 5 feet by this effect.

A remove curse cast on the target ends this spell early.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can target one additional creature for each slot level above 2nd.  If you use a 9th-level spell slot, you can choose to target only one creature and the spell lasts indefinitely until a wish spell is used to remove it.