All are lines of question marks, but I do know one of them is Dark Gate Bucket(mutation) and one is Infinity Bucket(ultimate).

Anyone know what the third is? And how do you obtain it, mutation?

344 Stun Gun Bucket
345 Dark Gate Bucket
346 Infini Bucket

344 is not a mutation, I think you get it in the same way you get the other Wind based weapons for the Maids (probably clearing at 100% some 90 NG+ dungeons).

Nope, cleared the five bonus dungeons, several times, second run. No Stun Gun Recipe. Perhaps third round?

Or is there some other condition aside from 'All Clear'?

Edit;
Or wait, I DO have Stun Gun Bucket recipe, #217 ?
...loading a save from last round, seems I lacked materials to make Eushelly bucket to use as an ingredient, that's why...

Resolved