Case file LinkedIn Crossclimb #877: 4-letter ladder, 5 middle exhibits, combo prompt "A two-word Latin phrase meaning "genuine" or "authentic."". Endpoints: BONA (top) and FIDE (bottom).
Middle phase answers: "Part of a skeleton" = BONE; "___ of one's existence (nemesis)" = BANE; "Hair on a horse's neck" = MANE; "Created" = MADE; "Gradually become invisible" = FADE.
Ordering phase: the valid middle chain is BONE → BANE → MANE → MADE → FADE. This permutation is the only valid one-letter chain for these answers.
Evidence link: BONA → BONE. A→E at the fourth letter (BONA → BONE).
Evidence link: BONE → BANE. O→A at the second letter (BONE → BANE).
Evidence link: BANE → MANE. B→M at the first letter (BANE → MANE).
Evidence link: MANE → MADE. N→D at the third letter (MANE → MADE).
Evidence link: MADE → FADE. M→F at the first letter (MADE → FADE).
Evidence link: FADE → FIDE. A→I at the second letter (FADE → FIDE).
Verdict: BONA → BONE → BANE → MANE → MADE → FADE → FIDE satisfies every one-letter constraint. The combo clue "A two-word Latin phrase meaning "genuine" or "authentic."" describes both end words together — "BONA" and "FIDE" each differ by one letter from their adjacent middle rungs and satisfy the shared top+bottom prompt.