Active from 1 to 31 May.
If you want to level up your account and Primes faster, then check this… From 1 to 31 May certain XP bonuses will be active on certain days of the week.
MONDAYS: +5% XP for SHOCK and THUNDER
TUESDAYS: +5% XP for VITYAZ and GLITCH
WEDNESDAYS: +5% XP for ISOTOPE and VISION
THURSDAYS:
+5% XP for QUARTERBACK and POISON
+25% XP for an account
FRIDAYS:
+5% XP for BLAST and JUMPER
+25% XP for an account
SATURDAYS and SUNDAYS: +50% XP for an account
NOTE! XP bonus activates at 12:00 (UTC).
All you need to do is just login and select the corresponding Prime, fight and get an XP bonus for each battle. And on weekends, be active to level up your account faster and receive as many valuable rewards as possible!