I read general grell was an easy boss to farm and that there was an easy method for just spawning outside his door every game.

True? If not what are some tips?

I heard he drops decent low level gear, he KO'd me once on a lvl 12 though Q_Q

i know theres a exploit where if you enter a phase portal and complete it, but exit without leaving the portal, it resets next time you make a game. don't know if that works for grell.

only the phase beast portal, go in \ clear but do not exit the phase beast portal. then "Exit" game, resume and rinse\repeat. but doesnt work for grell

Once you get to the 2nd act.

The luminous Arena is a good place to farm. When you get to the 2nd teleport pad. Don't take it for like 20 seconds, a secret entrance will show up that takes you to 2 more chests and a unique gem drop. Then goes back on the main path. Also the boss always drops a unique. You take the portal back to the genie and then you go back in the Luminous Arena portal to do it all over again.

As what to farm before you get there, I'd say just farm safe areas over and over again and maybe save up some gold and maybe test your luck with some gambling.