How about supply rating, how high can it go? Can you carry a supply rating of 1000 water? What is reasonable
page 7
"This means rolling a number of D6 equal to the current Supply rating – but never more than six dice."
While it's technically referring to the number of dice rolled, I'd say the intent is to cap supply at max 6. FBL uses the stepped dice system for consumables and it caps out at d12 if I recall correctly.
The supply dice pool made its debut in Alien where it is worded the same. My feeling with this is that the intention is to have supply uncapped and only have the
supply roll itself capped at 6D, but you could just as easily have it capped. Obviously the more supply units you have, the more it weighs (or you might be limited by a receptacle, like air in an oxygen tank), so there would be a natural limit.
FBL had an ascending consumable mechanic that capped at the d12, but it would also let you carry more consumables which you then track as units. I would hazard a guess that switching the whole thing to units was in response to this double mechanic which confused/s a lot of people.
But of course this is an SRD, so use it in your project however you want. These are rules you can use as written, amend, or ignore.
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