Have Gwen burn everyone is old.
However, just to show the new kid(Shiro) who's boss in GW, lets have Gwen replace the star skills for 1 day

Other then Star Strike summon " Celestial Assassin", lets have Gwen do the smack down.
I am not sure about how other star skills should change, but that is the idea

I also thought of having Gwen as collector npc, and players can exchange her cap, flute for some event items(mini Gwen will be nice

