This video shows a glitch that allows you to infinitely re-buy the 6 prayer beads that are available in the offering box. Only works on 1.05 and 1.06 (current patch), because it requires you to use the Reflection of Strength, which were added in 1.05.

The speedrun in question: https://www.speedrun.com/sekiro?h=All...

Thank you to ‪@brodducer‬ for letting me use his music for the outro.
You can find his work here: https://open.spotify.com/artist/3maqP...