Crop Failure Help

I'm a level 52 archer, and I'm currently trying to complete the crop failure quest. The problem is that there are so many monsters in the sewers that it is hard for me to hit the boss even a couple of times before getting slammed (and killed).

Basically, if you decide to help me, you will:

• Help take down the smaller mobs,
• Help take down the boss.

If we succeed and complete the quest, you will be given half of the emeralds (320 Emeralds).

Some notes:

• I mainly need you to keep the small mobs (silverfishes and zombies) away from me as I fight the boss.
• My timezone is GMT:-10.
• I am currently in Olux.

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No need anymore. Thanks to GaPoiVN, I completed the quest!