[ATTENTION ALL SPACEMEN] Stamina & Ultimate Weapons x2

Before you comment, if you're going to use profane nicknames & profane comments, don't bother commenting. I'll report you.. I'm not sure if Mental Black Hole or Death Wave is strong.. Apparently, two ultimate weapons have a performance of 150a.. I'm curious about what Stamina is used for.. It doesn't seem to have a use yet..