Dark magic world

My 58 AI, Yay :D {~ Story ~} In middle of peace, All kingdoms was infected with dark magic, It was caused by arch-mage ... Zothar... Now all kingdoms is infected... Expect kingdom ignitus, The one you in, It kingdom where most are fire mages {~ Main Characters ~} Star - Dont haves real name so named star, Girl, Inferno power, 19 Years Dark - Dont haves real name so named dark, Boy, Star's brother, Dark magic power but haves enough strong mind to weld it without causing chaos, 19 Years Alexander - 15 Yeared, Boy, Knight's helper (Forgot name of this rank used in medieval), Knows how to use swords and bows, Good at fighting, Dont haves powers William - 19 Years, Boy, Water power Elizabeth - Rich, Girl, 22 years, Light power Sophia - Elizabeth's best friend, Girl, 24 years, Light power, Kind of rich Vortex - Usually named vortex but his real name is edward, Boy, 33 yeared, Haves fire and water powers, Mayor of this kingdom (This kingdom more kind of big town) Zothar - His title is The dark one, 47 Yeared, Arch-mage, Uses full mastered dark magic, Haves also non-mastered gravity and time powers {~ Side characters ~} Peasants, Knights, Animals, Zothar's servants, And generally all characters that is useless, Or very rarely appears or we knows nothing about them, like rogues In this world magic is usually got on 18 years, And can be rerolled for 10K Coins (1K $ in real world, 10 Coins is 1 real $)