Record of the Guardians collection volume 2
Volume Two contains books 3 and 4 of Record of the Guardians series.
Record Three: Out of Patience

The Guardian of Revealing and Negation has her work cut out for her being tasked to watch the most mischievous Guardian in the group, the Guardian of Illusionary magics! She finds herself in a mess of desert trouble and thieves galore! When her troubles find her, she discovers the Guardian of Illusions isn't so bad to have around.

Record Four: Out of Bonds

One queen has to purify her collapsing kingdom using her fiery wit and skills. She drags along her icy, ex-slave comrade along by his timid heels.