Tanky - non-Dmg - AFK Build

Hi everyone,
I would like to hear your thoughts about this.
As a secondary char I would like to join my main char with an afk build that can stand all simulacrum waves b it's own.
Thought about going power charge stack, pta, high es and suppresion but it get's very expensive quickly gearing up for it.

Is there maybe a budget build that could fulfillthis this porpuse without spending hundreds of div?

Have you looked at chieftain, cast while stunned, detonate dead build?
Seemed popular last league...

Not sure about that since the main char will clear the monsters and without an leech for the afk char?

Won't you need enough damage to beat Kosis?

Dps is no problem. Main char can handle that.

I see.

RF and just don't turn RF on should be able to afk there I would think also RF is fun to play and level up.