User blog comment:SilverHexxitFights/Which is Terraria's Hardest Boss?/@comment-16009178-20131115050911/@comment-22434585-20140227040904

Depends on what you've got. Vampire Knives = Plantera DOWN

Chlorophyte Partisan (gotta be like the only time a craftable weapon is best for a boss, 'cept maybe the staves for the EoC) = Golem DOWN