Devilpillar is basically these builds below but you can change their elements to Fire and their sets for fire:
This build can be turned into devilpillar by changing Arcanist and Ascendant to Vampiric Touch and Inferno.
Technically my Seasonal Maidens' Build can be devilpillar too by using all Fire (but I called it Wildfire Summer Maiden
Basically Devilpillar is about hit frequency orb discordance build which can be wizard of rogue (usually pure fire). Superhigh hit frequency by orb+cosmic orb, very high Billions DMG , Immolate and Blistering Bleed.
Here's a great example of Devilpillar video.
Devilpillar is Inferno+Vampiric Touch+ Blistering and Elemental Crit.
Vollstandig more (shock) is sets that are best suited for bleed shock build but with high hit frequency orbs and stack Debuff, high voltage. If you had hirling , stack Debuff on both characters can seriously give you crazy DMG.
Frozen Mode is self explanatory.
Poison Mode is plagued and whatever else you choose.
Pure arcane mode is Arcanist and ascendant (ascendant for the weakening aspect and goes with Arcanist for any build but just as good on arcane+orbit build).
Of course you can also have elemental varients like Fire+ shock (could be stack Debuff hirling and pure fire main or main with fire and shock elements with high voltage and bleed which can also use explosions for spike damage). Ice+shock is either stack Debuff hirling with full ice Main or Main character with High Voltage and Frozen with Frostbiting but that mode is kind of redundant sometimes.