So, for the setting I am working on, I need to be able to model characters that have supernatural characteristics. Currently the system doesn't meet the need with the current 1-5 Rating scale because you can't really differentiate say a Human's 3 Brawn from a Giant's 3 Brawn and the system isn't built for Characteristic inflation. Even if you gave the Giant a 5 Brawn it wouldn't differentiate from a Human who bought a 5 Brawn. We want a way to represent that some species simply have a supernatural characteristic versus a mortal's while still using the same Rating scale. Does that make sense?
That said, I've looked at the Super-Characteristic section on p251 but we feel that the listed exploding die on a Triumph is rather lackluster especially sue to the rarity of it occurring (29% with 5 dice). Additionally, it seems to more represent Proficiency than Ability. Thus we've been looking at other options. What I'm currently looking at for options are the following, but I'd like to run this by people for thoughts on XP balance.
Option 1) Supernatural Agility (15 XP): Your character adds [1 Boost Die] to any Agility skill check.
Would this need a Strain cost to balance (if so, 1 or 2) or is it still too much even with a cost? The strain cost could represent the focus used to apply the super characteristic?
Or...
Option 2) Supernatural Agility (15 XP): Your character upgrades all Agility skill checks once.
Option 3) Supernatural Agility (15 XP): Your character may suffer a number of strain to upgrade all Agility skill checks by an equal number. Strain suffered this way cannot exceed your Agility Rating.
Thoughts?