Adventures of Mailgoat 20

The true recipient of the black letter has been found~

A magic radiates from the letter upon delivery

This is no normal letter delivery. Are the legends true?
A Mailgoaticorn?

Heading through the portal, what quest has been taken up?

Exiting into a distant land, Mailgoaticorn's quest has just begun.

Hesitantly Jackalope agrees to aid Mailgoaticorn, fully knowing what is at stake.

A Jackalopicorn!! But for what purpose?