|The following is based on Van Buren and has not been confirmed by canon sources.|
Devil's Tongue is a perk from Van Buren, the canceled Fallout 3 project by Black Isle Studios.
It can only be obtained through acquiring the epithet of Devil's Proxy, which requires convincing Sid to kill himself.
This perk gives the Prisoner +5% to their Deception skill.
- ↑ 1.0 1.1 Bloomfield Space Center design document/2 - Other Role-Playing Tests and Epithets