The Heroic Legend of Arslan 18

Crown Prince Arslan has bided his time in the southern port city of Gilan long enough: with Hilmes's betrayal leaving the Lusitanian forces in shambles, the time to retake the fallen capital is nigh. But as Arslan and his allies undertake their final preparations to free their country and their people from the invaders, Hilmes and King Andragoras each make their own moves to secure power over Pars for themselves.

Volume 18 of The Heroic Legend of Arslan manga series by Yoshiki Tanaka.