Book 8 : Tara Duncan, The Maleficent Empress (unofficial translation)

Banned on Earth for having (almost) destroyed Otherworld, Tara is cut from her past life on Otherworld. No news of her friends, Robin the handsome half-elf, Cal, the Licensed Thief, nor Sparrow the kind girl who can turn into a monstrous beast. Separated from her “magicgang”, time seems to stretch itself. But the day she turns sixteen, terrible news comes to her. On Otherworld, Magister’s Sangraves attacked each country’s leader… and her friend’s family! Some are hurt… others are missing… The young girl understands that Magister planned to destroys her friends. Without them, she is nothing, and he knows it. When they will be neutralized, power will be at his reach... The only flaw is that the culprit is not Magister… And what Tara will discover is even worse… Crazy with anguish and rage, she decides to illegally enter the magical territory to help Otherworld… even if the only way to do so is to go cross Limbo…