Look at the chaos builds here Beginner build guides Compendium (for AoM + FG expansions)
in particular moncccs chaos AAR and evil bakas chaos pyromancer 
one can also do chaos caster purifier / deceiver with https://www.grimtools.com/db/items/14209 off hand. Combined with the scepter you posted for sigil and doom bolt from occultist (and medal for sigil support) OR the medal for chaos mines for purifier caster.