Vampirism perk Nightstalker’s Footsteps only gives 20% bonus to sneak instead of the 25% in the description.
0010F1E7 : Nightstalker’s Footsteps (AbVampireSkills02)
DESC: Vampires are <25>% harder to detect when sneaking.
EFID: VampireAbSkills02 "Nightstalker's Footsteps" [MGEF:0010F1E6]
** add perk: 0010F1EC
0010F1EC: VampireSkillsPerk02 [PERK:0010F1EC]
EPFD - Data: float - 20.000000