Kidnap

Kidnap is a skill introduced in Fire Emblem Fates. It is the Personal Skill of Niles.

Fire Emblem Fates
If the player has a Jail in their My Castle, Niles is given the option to capture generic enemy units and select enemy bosses when they are defeated by him while using the "Capture" command. Niles will not be able to use battle skills and his Hit Rate will be lowered by 10% in battles that were initiated with the Capture command.