Chronicles of Kessandria
• Expertise also allows the rogue to select a skill that they are not proficient in from the class’s skill list and gain proficiency in that skill (instead of doubling the bonus).
• A Rogue who is already proficient in wisdom saves gains the expertise class feature again at 15th level instead of gaining slippery mind.
• At 19th level Rogues gain Crippling strike: A creature that is damaged by your sneak attack must make a constitution saving throw (DC 8 + your dexterity or strength modifier + your proficiency bonus) or have disadvantage on attack rolls and ability checks for 1 round. Undead and constructs are immune to this ability.