Tips for Writing Openings in a Continuing Series

Show reaction from the climax of the last book—someone has paid the price.
An overview scene showing destruction, growth and beauty that have changed from bk 1.
A dialog between characters arguing over the implications of the past or choices for the future.
Remind the reader of the rules of magic.
Avoid spoilers for plot/revelations in bk 1
Humor/self-consciousness about character flaws.
Trial or other consequences of the end of bk 1.
Hero is forced into uncomfortable parades/speeches
Ender’s Game ending for hero, seen as villain
Let some time pass or at least show worldview has changed dramatically