Elaine, Esna, Layla, and Nicole weren't made aware of Arthur's encounter with Luka or what had taken place during that encounter.
That was partly so they didn't have to worry, and partly because Arthur didn't want to recount the experience, though he doubted Elaine was as unaware as the other three.
He had this feeling Elaine knew, and was simply acting like she didn't, only because he didn't want her to.
As for Esna, she wasn't on Nienope when Arthur arrived. During their time in the Valmone Universe, she had spent most of her time on Arthur's other planet, Shoisan, instead.
It had been mentioned before that Esna had grown into a capable administrative manager, and just like Stelan was the Regent governing Nienope in Arthur's absence, Esna held that position in all but name on Shoisan.
Because of her focus on work, she was the lowest level among the three Arthur had brought to Valmone from Hell, only a Deity Level 420, just barely an Inferior Mid-Tier Deity Realm.
