Artaxerxes (𐎠𐎼𐎫𐎧𐏁𐏂𐎠) is bug fixed version of Xerxes font (available on old folder) which also passes OpentypeSanitizer test so can be used as a web font.
Released under the exactly same license with the original font license (GPL with exception) which can be find on COPYING.
Download TTF, EOT and WOFF from release tab.
How to use web font? Read this.
DO NOT use Xerxes.ttf from old folder which is not usable as a web font.