This is brilliant.
the general formula for a basic <30 word logline/outline:
protagonist + incident + conflict + goal
Oh. My. Goodness.
I get so caught up in details, I overlook the Big Simple that lurks behind summaries and loglines.
"Two women in 1849 cross the American southwest following rumors of uncanny events. Hounded and trapped by fanatics, they find a way to disrupt the horrors being summoned from beyond the veil the isolates our realm."
Maybe I'll start with a version of this for my next query.