Mine, fragmentation

Mines can be set to detonate when a creature comes within up to 15 feet of it or paired with a remote detonator. As an action, you can prime and set a mine on a surface you can reach, which arms at the start of your next turn. When detonated, each creature within 15 feet of it must make a DC 14 Dexterity saving throw. A creature takes 2d10 kinetic damage on a failed save, or half as much as on a successful one.