You can do it with a kraken weapon and the pieces of blood. Almost all enemies are immune to your regular attacks, except krak proc. You want to use kraken daggers proc to kill the mobs. In the entire map there are I think a total of 10 enemies that take severely reduced damage, but do take damage, so you can proc. In the first little bunch it is one of the rangers. Proc your kraken daggs on it and while proccing kill mobs until proc runs out. Then in the next bunch find the enemy that takes damage again and try to proc, clearing again and so forth. GL