High-end beach wardens keep an enchanted pail like this to replenish sand lost to natural elements. The origin of the sand has since been lost to time, but some suspect the pail pulls sand from a desert elsewhere.
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Pail of Excess Sand
Wondrous item, uncommon
This wooden pail appears to be empty upon inspection. As an action, you can flip over this pail and speak one of three command words, where upon an amount of sand pours out of the pail. The sand stops pouring out at the start of your next turn. Choose from the following options: