Storyline Question - Yagudo Stones

[Kirschy]

I'm Re-doing Rank 4 Mission for the 3rd time, and getting the Magicite in Castle O. They run a CS /w some Windurst past, and I understand all of it, until Ajido-Marujido is talking to the Yagudo Avatar about Sarutabaruta. Now I understand the Windurst storyline, but Ajido speaks about digging and stones.

"What about you Yadudo? What are those things you continue digging? Those stones..."

I understand everything except that line, what digging, what stones?

[Rakshaka]

I think Ajido's referring to the Magicite in castle O