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i've only played two of the scenarios (Cycle of Eternity and Cult of Sentinel Hill) so far. Do the rest have an "end boss" conclusion? not super fond of that conclusion so far, but i'll deal if that's the case.
Not exactly. They all escalate and have some big threats near the end, but they don't all culminate with a boss.
San Juan de Aznalfarache
I'd say no, mild spoiler ahead:
Spoiler (click to reveal)
There is a boss monster near the end of the first adventure, but I wouldn't call it an "end boss", to me that means you defeat the boss and win. And the win condition is quite different from that.