Most Cult of the Lamb losses share a shape: a small slip that compounds.
Mistake 1 — letting faith slip
A hungry follower loses faith. A faithless follower turns. A turned one spreads. One missed feed starts the chain. Feed on schedule; it is the cheapest fix.
Mistake 2 — over-recruiting
A cult you cannot house or feed is dead weight. Recruit after you can hold them, not before. Space and food come first.
Mistake 3 — greedy crusades
The room past your limit ends the run. Skip the chest behind hard enemies. The next crusade is reachable; a dead one is not.
Mistake 4 — wrong weapon
A slow weapon you flinch with clears less than a fast one you trust. Pick for your dodge, not the number.
The two checks
Check faith before you leave the cult. Check hearts before a risky room. Both take a second and fix most runs.
The errors that end runs
The biggest one is neglecting the cult while crusading — come back to rot, low faith, and a revolt. The second is sacrificing followers you needed for labor; you starve the farm to please the doctrine. The third is entering a bishop fight un-upgraded, treating it like a normal room. And never skip cooking: raw food rots and a hungry cult loses faith.
Two checks before a crusade
Confirm faith is stable (preach if not) and confirm you have food banked. Both take a moment at the cult and prevent the wipe-back-home that costs the run.