Legilimens is a spell from the Harry Potter series that allows a wizard or witch to delve into the thoughts and memories of another person. It is often used to extract information or to understand someone's feelings and intentions. The spell requires a certain level of skill and concentration, as the target can resist or block the intrusion. The practice of Legilimency is considered advanced magic and is typically associated with skilled practitioners, such as Severus Snape and Voldemort. While it can be used for good, it also raises ethical concerns about privacy and consent, making it a controversial aspect of magical abilities.