rot-13 details on how to start the side-story:
Qhevat gur rcvybthr, gurer vf n arj qvnybthr ol Plaguvn gung jvyy haybpx gur fgneg bs gur fvqrfgbel.
Lbh jvyy arrq gb nyfb tb onpx gb gur bevtvany znc naq erivfvg Plaguvn'f ynfg fprar va gur puncry gb teno n arj vgrz.
Tbbq yhpx vairfgvtngbe.