User blog comment:SilverHexxitFights/Which is Terraria's Hardest Boss?/@comment-24151017-20131111054633/@comment-24021074-20131111140520

@ KickMeElmo: Dungeon Guardian is ment to be killed, otherwise it wouldn't drop the Bone Key. But it wasn't ment to be killed, before v1.2.0.3. :P So it its boss kinda thing nowdays atleast.