i-mindtraveller asks: Hello, thanks for your work, especially those monster stats! Do you know why for Vax a 19 is already considered a critical roll? Is that a house rule? I couldn't find any info on this in the books...

Thanks! From what I’ve found in 5e, only Fighters with the Champion archetype have the Improved Critical ability (PHB, p.72). Percy’s Gunslinger seems to be based on the Fighter class, so it makes sense for him.

As for Vax, I haven’t noticed 19 come into play as a crit since it appeared in the first couple episodes. Pathfinder does allow Rogues to apply Improved Critical to specific weapons. If Matt still allows it, it does indeed appear to be a house rule that carries over, falling under the purview of aspect of the magical weapon. Update: The Keen Dagger is responsible for Nat19 being a crit!