ward

You implant a holy symbol in the ground that casts a 5 ft radiant ward in the path of enemies. If a creature passes through they must make a CON save (disadvantage if undead) and take 1d6 radiant damage on a failed save and half as much on a successful one.

A creature can attack the holy symbol to attempt to dispel the ward. The symbol has an AC of 20 and has 15 hit points and when attacking the creature has disadvantage.