I'm just of the opinion you don't muck with the stats on a player's sheet (which they depend on) unless you tell them. First, because if they know about a change they can keep track of it and implement it where necessary, instead of the GM (always a plus). Second, because I consider it a polite thing to do: if in the heat of battle my GM says to me "btw your strain threshold is 4 lower because of Reasons, so that hit knocked you out," I'd be pretty pissed since I might have, you know, acted differently had I had more information about my character available to me. I mean, GM fudging is one thing, but that just makes it feel like the mechanics are stacked against you from the get-go.
But hey, you think that's not a big deal, I think it is, that's fine. Different tables for different folks. And I'm sorry to the OP is this is a derail.
I'm confused. You do realize that the lowering of Strain Threshold from Obligation coming into play does not inflict strain damage right? It just lowers your top end. So if you start the session at 4/12 strain, and I tell you I rolled doubles so you lose 4 strain, you don't suddenly pass out. Instead of 4/12 you are 4/8.
Secondly, I tell you at the beginning of the session, not as a "oh btw" halfway through. That's rude.
It sounds like Shadai is doing Obligation in a way that departs significantly from the Core Rules. What is detailed there is that everyone's obligation is totaled together as a chart at the beginning of the session (Highest to Lowest in ascending order) and then the d100 is rolled to see if it hit's anyone's obligation.
What people have been talking about is the option of doing this at the end of the session.
What Shadai seems to be talking about (forgive me if I am mistaken) is rolling for each individual obligation at the end of the session in which it is added.
I like the idea of rolling on the RAW obligation chart at the end of the session because ALL it changes is that everyone knows that so-and-so's Obligation came up before the next session begins, and so it can heighten the tension and expectations.
I'm not a fan of changing up the Obligation rules, though. IMO it's a great system that feels right for the game.
Away you are indeed mistaken.
My only departure is rolling for Obligation at the end of session rather then the beginning. I do this for the reasons you stated in addition to the fact by doing it between sessions I can prepare for it if I want to bring it into game.
I do not roll each obligation individually. I just keep my own total of character Obligation, spread it into a d100 chart and roll it once for the entire group. It's not a significant departure at all.