The chest treats both the arcane lock spell and the knock spell as a dispel magic spell.

The chest is incapacitated while in the area of an antimagic field. If targeted by dispel magic, the chest must succeed on a Constitution saving throw against the caster’s spell save DC or fall unconscious for 1 minute.

While the chest remains motionless, it is indistinguishable from a normal chest.

The creator of a chest can specify under what conditions the chest will open by informing the chest audibly as a free action. This can be as general or as detailed as the creator likes, though it must be based on visual or audible conditions that occur within 60 feet of the chest, including the use of a specific key. Any creature wishing to open the chest without permission must first pick the lock and then force it open.

The DC to pick the lock is 25, and the chest is free to use its reaction to relock itself, requiring a second attempt very quickly.

To open the unlocked chest against its will requires a contested Strength (Athletics) check.

The chest cannot relock or contest an Athletics check while it is unconcious, though it remains locked if it was already. The DC to unlock an unconcious chest is 15.