Diablo 4 is celebrating three years of demon slaying with increased XP rewards, the return of the game’s March of the Goblins event, and daily free cosmetics, but players won’t have long to take advantage of them. From June 2-9, players will enjoy the Mother’s Blessing XP buff, granting increased multiplicative XP in both the game’s seasonal and Eternal realms. That will also be the same day the game’s March of the Goblins event returns, heralding increased treasure goblin sightings…