Catching a fever a few days before summer is not exactly a common thing, and yet, we highly encourage you to catch this one. Not that the sun isn't nice, but large sums of XP every three battles are even better! Make the most of the latest XP Fever from 15 June at 07:00 CEST to 18 June at 07:00 CEST (UTC+2) and don't forget to make the most of a better conversion rate from XP to Free XP (1 = 35).
