Wisdom cubes are the resource used in Azur Lane to construct/summon new ship girls.
@TheKleptomaniac
In other news Akagi put Enterprise down *hard* there. Damn son. The meaning behind that one is connected to the Battle of Midway. The entire Kido Butai, the First Carrier Strike Force, the IJN carrier group that perpetrated the sneak attack on Pearl Harbor was sunk at Midway. Akagi and her sisters did not go easily or quietly. They more or less burned to the water line, proud warships reduced to pits of misery and death, grave yards for their crews, the cream of the crop of Japanese carrier aviation in every dimension... just as soon as they were torpedoed to put them out of their misery.
Basically Akagi is saying Enterprise wouldn't be so eager to train a little girl for battle if she'd had to watch helpless while her sisters died a slow, agonizing death before succumbing herself. Which is on point because Enterprise's sister ship USS Yorktown was indeed sunk at Midway. It was by all accounts a rather orderly affair, not a lot of loss of life or horror stories we'll never hear told for the sailors aboard her. They'd almost managed to save her when a IJN submarine delivered the coup de grace and Yorktown slipped beneath the waves.