Weapon (dart), uncommon
This five-pointed dart is decorated with pieces of ever-frozen ice. When thrown, a streak of shimmering icy dust trails behind it. A target hit by the dart takes an extra 3d4 cold damage; it then takes 1d4 cold damage again at the start of each of its turns for 1 minute. The effect ends early if the target takes any fire damage or it uses an action to fall prone and roll on the ground. Whenever you roll a 4 on the cold damage dealt in this way, the target's speed is reduced by a cumulative 10 feet; this effect can't reduce a creature's speed below 10 feet. This penalty lasts for 10 minutes or until the target takes any fire damage.
Once the dart hits a target, this property ceases to function until the next dawn. Until then, a target hit by the dart takes an extra 1d4 cold damage, but doesn't suffer any penalties to its speed.
Even the boldest learn that haste can falter beneath the weight of the stars.