Basically before, it was an alternative to Ultimate Mode which boosted your melee speed and cleared a huge area of projectiles (like the current Ultimate Mode) that slowly drains your VP after activation.
They took out Valkyrie Mode and now they have Booster Mode.
wait wut.? how to activate that booster mode or something.? @_@
+ Rep If you want to | Currently Playing:Valkyrie Sky
It's just a quick dash (default button is x, I believe).
Originally Posted by Xpecial
When you start the stage, you have this red ball circling you, when you don't attack that ball thing slowly charges up into a full circle. Each time you boost, you use some of that (basically encouraging people to not hold the attack button 24/7).