The egg was another reincarnation reborn as a dragon. It was taken away by soldiers as they can tame dragons if raised from birth, and so she ended up becoming a royal family's pet, whose prince is also another reincarnation
The manga barely covers what's happening outside the dungeon, but the upcoming anime seems like it will feature the missing parts from the novel.
actually, the cover is a big spoiler, you know it already if you've read the novel. the reason it shows human girl and spider at the same time is because
@HIVARNA early story is our girl winning through smarts as she is actually really weak.
She gets strong later on only to be eclipsed by the absolute monster that is our favorite waifu/motherfu ariel
and ends up fighting excessively harder challenges.
she then gets ridiculous power creep.
What makes the novel truly great are the side stories that I presume are now finally going to be drawn very shortly. They were in the light novel from book one and
Cover the reincarnations of the rest of her class and fool you into thinking they're fighting for the good guys
Whats really fascinating about this story is the world and everyone's efforts to save it,
Well, also Ariel is best waifu not to mention best motherfu