Figure I do a showcase for this build because of how well it worked in Ruthless Gold (the event's actually harder than normal Ruthless), and if it works well in Ruthless Gold it kind of means the core mechanics are solid enough that on a normal league start this would be just insane.

The damage is enough to do pinnacle content pretty comfortably and the speed makes it a fast mapper even without movement skills (180% movement speed with a 30 second duration berserk). There's also a lot more room to scale damage in a non-ruthless setting.

TL:DR if I can accomplish this in under a week for Ruthless Gold event, you could probably get more done in a normal league start.

POB:

https://pobb.in/Huw9qnxjY2iS

Brief guide:

This build league starts as Jungroan's Cold DOT and slowly transitions to Icicle miner about level 60 onwards when you can get the gear for it and have levels to start picking up mine passives.

It utilizes alot of the scaling mechanics for Hexblast Miner (the Rathpith/life stacking/perma Berserk from Kaom's spirit) but simplifies most of the gear requirements by scaling Icicle mines instead (allowing for March of the Legion's insane +9 skills and Heatshiver damage scaling).

March of the Legion's potential +9 is unprecedentedly strong. Because Icicle mines can get +9 from a combination of multiple implicit rolls, AOE/Auras/Trap&Mine/Projectiles, hitting a usable double corrupt is plausible within a reasonable time frame.

This also means you don't get the mana reservation/cost multipliers of a 6 link mine setup and don't have to worry as much about mana reservation and mana costs.

Icicle mine also happens to work with one of the strongest and cheapest damage scaling mechanics in 3.20, that is heatshiver. Because hitting 100% crit chance with Icicle Mine's base crit of 6% is trivial, you're almost always going to get your freezes off unless against rare mobs with very specific mods.

As long as its core mechanics of Rathpith+Kaom's Spirit+Dissolution isn't nerfed it's ok if we lose heatshiver's multiplier next patch because it opens up other possibilities like Pyroclast +Astral Projector.

Hope you enjoyed this writeup and build!

As usual, feel free to ask any questions.

My end of the event video, you don't need to watch this, its only if you want to see me map abit.

https://www.youtube.com/watch?v=4gr2HEXDPeM&feature=youtu.be&ab_channel=Uberjager