Interacting with Objects
A character's interaction with objects in an environment is often simple to resolve in the game. The player tells the DM that his or her character is doing something, such as moving a lever, and the DM describes what, if anything, happens.
For example, a character might decide to pull a lever, which might, in turn, raise a portcullis, cause a room to flood with water, or open a secret door in a nearby wall. If the lever is rusted in position, though, a character might need to force it. In such a situation, the DM might call for a Strength check to see whether the character can wrench the lever into place. The DM sets the DC for any such check based on the difficulty of the task.
Characters can also damage objects with their weapons and spells. Objects are immune to poison and psychic damage, but otherwise they can be affected by physical and magical attacks much like creatures can. The DM determines an object's Armor Class and hit points, and might decide that certain objects have resistance or immunity to certain kinds of attacks. (It's hard to cut a rope with a club, for example.) Objects always fail Strength and Dexterity saving throws, and they are immune to effects that require other saves. When an object drops to 0 hit points, it breaks.
A character can also attempt a Strength check to break an object. The DM sets the DC for any such check.