Elephant Infernal Legion ~ here is how it actually looks like

Heard we are posting Elephants.

► PoB: https://pobb.in/D5R1g7C_q8Xp (at the time of recording)
► PoB (updated): https://pobb.in/MzsIsZXdSp72
(Lucky sanctify into +4 Amulet, on my way to 200k hp Elephant)

►Alternative tree I used until lvl 95: https://pobb.in/vS01JZ7WK1iT
(less minion aoe but more ES, with "Rupture the Soul" for extra clear)
► Ninja: https://poe.ninja/poe2/profile/Prevy-1389/character/Prevy_Beastkeeper

TL;DR:

Tamed Beast Elephant with good Mods > Bogfelled Commoner Spectre > Tamed Beast Elephant with bad mods > everything else

Why:

Mods on Rares can scale Infernal Legion. Tamed Beasts keep up to 4 mods.

"Increased Area of Effect" is the most important mod for clear.

Mods for damage:

• "Extra Fire Damage" directly scales the Ignite from Infernal Legion.
• % of Damage as Extra Cold/Lightning/Chaos also works when paired with Bringer of Flames or mods like “All Damage Ignites” on Rare Monsters
• I’m using the Lineage Support Xoph’s Pyre to enable Chaos damage to ignite, combined with Unholy Might and a beast that has “Extra Chaos Damage” + “Extra Fire Damage.”
• further scaling is possible with Evergrasping Rings
• Infernal Legion can also crit if you give it flat crit chance
• Xoph's Pyre + Unholy Might + Evergrasping Rings can also be used for Bogfelled Commoner Spectres

Assuming a double damage mod Elephant, there is nothing that currently comes close in terms of damage. You can also get Abyssal Mod Elephants for even more stupid things.

Video is 8 days old. Cost of the build has massively increased, specfically the Prism of Belief jewel.