Zennin Ossan, Umarekawattara SSS Rank Jinsei ga Kakutei Shita - Vol. 10 Ch. 116

[MangaDex]

 

[dmbase]

A magic hole that can rot anything within days. Yeah, I'm sure there's no chance that it could ever be exploited for terrible things... /s.

 

[RioghanDer2te]

A magic hole that can rot anything within days. Yeah, I'm sure there's no chance that it could ever be exploited for terrible things... /s.

I was thinking the same, but then there was the short mention of "selective rotting" on page 11, so all is accounted for.