From May 7 until June 3rd, your first conversion from Warpportal Energy into Item mall points will receive an additional 20% bonus points.
Take note, this event will replace any pre-existing bonuses for the month. If you have already received the 5% bonus for May, don't fret as you can still join the 20% bonus event.
This applies to all Warpportal game titles, so be sure not to miss out. May Spring be with you.