Jeff Hamster and Jeffery Skull. (Spoilers to Various HC series + the most recent one) One thing that I noticed was that ever since Minecraft Hardcore #2's debut of Jeffery the skeleton (besides the Diablo Hardcore). 

There's been one constant with Jeff, who's name is suspiciously similar to our skeletal friend.

In each HC where he wasn't present, the group has failed.

And whenever the group failed with him present, his death was shown on the last episode of the season.

And as of this series, we've got lone survivor Jeff. (Noticeably, not a skeleton.)

Could this be the curse/blessing of Jefferey the skeleton?

Are all who play Minecraft or Terraria doomed to fail without him?

(Obviously not really, but it makes a nice lore/mythos bit imho)