Can you elaborate on how token visibility, health visibility, and so on are effected by faction settings?
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There are GM options that display status icons and health details based upon the factions. More details on the behavior would be nice, but I suspect can be found via experimentation.
Yeah I did a global source check (5E/CoreRPG) for "faction" and saw where it was used. Not anything that will harm the way I mangle it to my own uses. I can still target, attack, save, and move and have the LOS applied regardless. That is good enough for me. The fact some things will only do some display stuff for "friend" or "foe" were "mostly harmless" to me.