One of the things I was most curious about how they were going to adapt this season was the explanation of Claire's newfound powers. I never thought that the way the LN described this part was very clear and it is only through later discussions with other fans that I got a good understanding of it. I think that the anime actually does a better job of setting up and explaining this. Plus, we get to see Aurora-sensei and JK Claire in the process, so that is a win.

The fight sequence was quite modified from the source, but I actually really like it. Characterizing Elizabeth's attack as literally raining blood was a great touch. My favorite part of that sequence was Aurora/Claire trying to use Cid's All Range Atomic. This was a great anime original touch and I loved everything about it. From her initiating it, Beta realizing what is going on and freaking out, and finally Aurora trying to do the Cid atomic voice. Just chef's kiss.

We get to see a new ED this episode by Maaya Uchida (voices Nu). We also get to see the setup for the next arc in a post-ED scene. If you liked the design of Yukime and didn't want to see her leave the story yet, then this scene should give you hope. Also, just as a meta-aside, the next arc is probably the overall fandom's favorite, so look forward to it!

Edit: I forgot to mention that this begins one of my favorite ongoing gags in the whole series. In which Cid thinks Claire is just a chuuni having chuuni delusions about things.