<Li> "Descent" (光臨, Kōrin) </Li> <Tr> <Td_colspan="5"> Eren and his friends confront Reiner and defeat him using a new weapon, the "Thunder Spear", designed specifically to penetrate his armored Titan form . With his friend in trouble, Bertolt joins the battle; he transforms into the Colossus Titan to assist him, eliminating a large number of the Survey Corps in the process . </Td> </Tr> <Tr> <Th> 20 </Th> <Td> August 9, 2016 </Td> <Td> ISBN 978 - 4 - 06 - 395720 - 4 ISBN 978 - 4 - 06 - 362335 - 2 (limited edition) </Td> <Td> December 27, 2016 </Td> <Td> ISBN 978 - 1 - 63236 - 309 - 1 ISBN 978 - 1 - 63236 - 454 - 8 (special edition) </Td> </Tr> <Tr> <Td_colspan="5"> <Table> <Tr> <Td> <Ol> <Li> "Perfect Game" (完全 試合, Pāfekuto Gēmu) </Li> <Li> "The Unknown Soldiers" (名 も 無き 兵士, Na mo Naki Heishi) </Li> <Li> "Promise" (約束, Yakusoku) </Li> <Li> "Hero" (勇者, Yūsha) </Li> </Ol> </Td> </Tr> </Table> </Td> </Tr>

When will chapter 108 of attack on titan be released