The “absorbs anything, including DF powers” + “the body itself feels pain” rulebook is now on-page (Ace @0441, Luffy @0544) → confirmed. The multi-fruit mechanism this rulebook ultimately enables (Blackbeard holding more than one Devil Fruit) stays open in Blackbeard Multiple Fruits — that payoff is forward.
Earliest known caller
(Unknown.)
Why this matters
An explicit Chekhov rulebook for a fruit whose absorbing nature is later the leading in-universe explanation for Blackbeard’s rule-breaking multi-fruit ability (see Blackbeard Multiple Fruits). Cross-link Nature of Devil Fruits.