Cudgel of Entry

The Cudgel of Entry is a magical weapon which allows its wielder to easily open locked doors. It appears in  Ultima Underworld II.

Description
A unique magical item which could be found amongst the belongings of the warrior Dorstag, the cudgel of entry offered no special benefits in combat, but rather allowed those who brandished it to deftly smash apart stubborn locks with ease, making it an efficient (if not precisely stealthy) means of entering sealed chambers. With such an artifact in their possession, an adventurer could largely dispense with lockpicks and spells of  opening.