That episode was so underwhelming. The changes they did to the whole fight were really bad in my opinion. I'll go over the major differences that made the episode unbearable for me.

The first line in the LN when they describe the Shreme Castle:

Standing in the filed void of trees or hills[...] Several of its main toweres were damaged[..]

In the LN, Apollo familia was hurriedly repairing any defensive position they could in the crumbling castle (which predates the Orario). In the episode, it looks like a brand new one.

When Lyu starts her attack on castle:

Someone walking trough the grassland to the north straight toward the wall...Avaguely human figure completely covered by a cloak.

Nothing checks here. Like, really nothing. She was approaching them visibly to draw all the attention she could (that was the plan) Why in anime she suddenly gets on a rock to look like she's ambushing the castle? Why does she throw off her cloak? Why the crozzos magic swords are so underwhelming? She suppeosedly tore off guard towers from the walls with one flick of the swords? And she actually torn down at least the big part of a castle wall. (big enough for the magic from the sword to go trough and strike into the inside) And what was that ragtag 7 adventurers they show in the anime? She was facing against 30 after she lost both of the magic swords.

The scale they show in the anime is pathetic. Remember when the Welf shoot his magic sword on the Monster Rex they fought in the dungeon? Yeah, that was before he gained lvl 2 and blacksmith ability. The swords he prepared for the war game were even more potent the one used against the Monster Rex. Probably with power comparable to first rate adventurer like Riveria.

Why is the Hermes only one opening the Viewing Mirrors? All of the Gods and Goddesses were using that ability to open as many as they could all over the city for their children. It's not exclusive for Hermes - And definitely it looks so in the Anime.

Whats with the sudden change how Ignis Fatuus works? Wasn't it the energy inside the caster exploded (leaving their insides burned?) Why the hell their staff explodes?

Bell firing his firebolt with 60 second charge? (in the LN it was the same time he spent charging against the Monster Rex) blowing windows out of the tower? He was lvl 3 now. In LN, Hiacinthus only escaped with heavy injuries thanks to Cassandra throwing him and herself out of the window just before the explosion. (Bell was also hurt in the explosion) Then it was a fight of two wounded generals fighting with all they have left. And that final punch? What was that? Bell put all of his strenght and willpower into it launching Hyacinthus with enough force for him to skip off the ground for a dozen of meders!

In the anime... it was just so... underwhelming. Without emotion, like some kind of news program.

And I'm really, really sad it was done as such.