As far as Casters are concerned (beginner melee chaos can be strong and easy to make too just not my specialty) things that come to mind:
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AAR: [1.1.8.1][Guide] The Rookie Bloodsworn - A chaos Warlock Beginner Guide
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Sigil of Consumption: [1.1.7.1] [Pyromancer] Ruinous Apostle
(could be Deceiver too / one could add Oblivion to it after fighting a blueprint) -
RoK, DB, Sigil (there’s leveling on playlist): [HC] Grim Dawn build highlight - Abaddoth Deceiver, chaos Kalastor & Doom Bolt & Sigil - YouTube
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Chaos FoI with this faction item: Solael’s Devourer
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you could probably make some build around Blood Orb’s Elemental → Chaos conversion