PACH/COLD/LIGHT
Since pacheon dosnt give you that much def, both light and cold are important. You need ice for snow shield, iceberg wall, ice rain, frost nova and the imbue and you need light for the grass and ghost walk and ofc the nukes.
Fire would prolly increase your DMG but what you need is defence.
And a good bow.
Cold imbue makes the pain go away.