Mars is a melee character. His primary attribute is strength. The hero is mainly taken as a hardlaner. Most effective in the mid game.
Abilities such as Spear of Mars and Arena of Blood make Mars a valuable ally and a good initiator in team fights. Aghanim's Shard upgrades Spear of Mars making it more dangerous in mass fights. God's Rebuke allows Mars to last hit distant creeps. In the late game, this ability becomes an especially formidable weapon. Bulwark makes Mars a real frontlaner able to cover his allies from ranged heroes’ and towers’ attacks, and Aghanim's Scepter upgrades Bulwark allowing the hero to deal significant area damage.
Mars has spent his entire life waging endless war. One day he began to question to what ends he swung his glorious spear. Now he seeks tto burn down the pantheon of the old age and build a just new empire atop the ashes of his kin. Only then might he find satisfaction, and make the glory of Mars evident to all.