User blog comment:Lasifer/Hellstorm Issue 6: Beowulf vs. Achilles/@comment-4661256-20130619215941/@comment-422690-20130623194248

It's never given anything other than a description. Homer waxed poetic about how unique Achilles' spear was (Freud, where are you?) and how no other man could even lift it.

Essentially, it's a spear that is far heavier than normal ones.