Level: Bat Country. ( Bats are easy )
Character: Queen Sigma. ( has 100 rerolls, banishes etc)
Use aracanas.
Aim for the one that creates " damaging zones"
Stay near the jester guy you can buy weapons from to be safe so when you get a few off you can just buy 3 of the weapons off him to get some extra banishes to be safe.
Take king bible and garlic and level up a few times, upgrade the garlic a few times to be safe then just idle kill all enemies and keep banishing weapons or re roll until a weapon appears, literally took me max of 10 minutes!