how to get arc logic?

[Iskandar]

I have a god roll. but its legacy item RIP AAAAAAAAAAAAAAAAA

[Krenk the Haug]

Same ways as before. I believe after the totem encounter in pit of heresy is where it is most commonly dropped

[DakotaThrice]

I you've acquired the Essence of Failure then you can't a repeatable bounty from the Lectern of Enchantment on the Moon that will award Arc Logic on completion.

[Nakos]

Originally posted by DakotaThrice:

I you've acquired the Essence of Failure then you can't a repeatable bounty from the Lectern of Enchantment on the Moon that will award Arc Logic on completion.

Yeah, that. You can just go do that quest as often as you like.

Mind you, there are some other Arc Auto Rifles now ...

https://www.light.gg/db/category/1?page=1&f=9%285%29%2C4%285%29%2C%2C-56%2C%2C%2C%2C%2C%2C23%282%29

Come To Pass is pretty easy to get on the Throne World.
Sorrow's Verse is an average drop from Crucible.
The Number is in the world loot pool this season.

And ... there's always Hard Light too.