I’m wondering about Bastion G013’s sentinel generation; is there a limit to how many can be generated and on the board during a game? I know I can’t generate and place one if there isn’t space adjacent to Bastion. Basically, can I theoretically be making a new sentinel every turn and swarm the map?

It helps to quote the effect in question:
STOKING MUTANT HYSTERIA: THE MUTANT ERADICATION BEGINS: Leadership. When Bastion uses it and succeeds, instead of the normal effect, you may generate a [XDPS] #G002 Sentinel. (When generating them, roll for their trait to determine starting click.)

There is no stated limit and generating them means they come from outside of the game. The only true limit is how many you own... and how much space is on the map.
WIN has ruled that if there's not space adjacent to either not place or place as close as possible for different effects (or maybe they changed the ruling when a new came up)... if anyone remembers or can search better than I can, please post that part of it.

Sorry, I should have quoted the effect. Thank you for the help, very much appreciated.

If the effect is optional and would violate the Rule of Occupancy, you can not choose that option. If there is no option given and you must complete the effect, then you use the nearest legal square.

That was the difference, thank you. I was on my way to bed and too tired to do a good enough search to find it.

also.. there is a cap on victory points.. i can't quote it.. (i don't remember the details).. but if you score a bunch of points.. the game ends early.