Awaken your latent power of [Arc] Arc Light by earning experience, generating Orbs of Power, and defeating combatants to earn points; using [Arc] damage grants substantially more points.
Energy weapons deal elemental damage. Arc element weapons can be identified by selecting them in your character screen and looking for the [Arc] symbol.
"You see it in the filaments of energy, reaching for more foes. The chains of searing Light. Arc energy hungers for more Darkness to destroy." —Auren Velt, Warlock