Mastodawn

Book 25 is book 6 in the series, but this time it's "Bastille vs the Evil Librarians" by Brandon Sanderson and Janci Patterson.

Edit: finished ... in an hour.

Book 24 is back to Alcatraz Vs The Evil Librarians book 5: "The Dark Talent" by Brandon Sanderson.

Edit: finished 8th May.

Book 21 is, surprise, book 4 in the series: "The Shattered Lens" by Brandon Sanderson.

Edit: finished 7th May.

Book 20 is the third in the series: "The Knights of Crystallia" by Brandon Sanderson.

Edit: finished 29th April.

Book 19 is the second book, "The Scrivener's Bones" by Brandon Sanderson.

Edit: finished 25th April.

Book 18 is "Alcatraz Vs the Evil Librarians" by Brandon Sanderson.

First in the Evil Librarians series, this is one of Sanderson's non-Cosmere series.

Edit: finished April 23rd.