Hi guys, I'm starting a campaign and I need some help with the rules. A player in my group is torn between playing a Human or a Clawdite. The character would be a Sentinel Shadow. The Human has more starting XP but the Clawdite is a changeling. The rule reads: "At a cost of 2 strain, a Clawdite can choose to upgrade their Deception check to convey a false appearance etc...
The rule doesn't say what kind of upgrade so I need some advice there. If he takes another form what kind of check should he need to pass it?
I only have the 3 core rulebooks and the FaD GM book. He used OggDude's app to create a Clawdite, so if there is a rule in another book I would appreciate someone letting me know.