[Estavali]

Spoiler for On Krusty's Overskills stated in @wiki:

The first one, Hyperion Eye (〈空を征く瞳〉《ヒュペリオーン・アイ》), was awakened in Volume 4, apparently during Akiba's first expedition. The second one, Mnemosyne Taboo (〈追憶の断裁〉《ムネモシュネ・タブー》) is, if I'm not wrong, obtained sometime around the events of volume nine. Whether this means Krusty was somehow thrown onto the mainland and got it for his pains, or that he had gained this ability while still in Yamato at the same time when Kanami's bunch were having fun, is beyond my ken =3

Krusty kept mum about Mnemosyne Taboo and as a result, it is not among the eight Overskills that Lize had mentioned, the ones that D.D.D. has.