First, krux's 'minion' is named terragon.
You want to attack terragon first. If your spectrobes are at a high enough level, three or
maybe four charge gages should finish terragon off, and if you have a charge attack that
darts forward or something, wait until krux is in front of terragon, and then you'll be
able to hit them both.
After terragon is dead, then all you have to do is worry about krux. He'll start
teleporting around the stage. You need to wait until he pauses and floats there. If you
have a shakablad, do not use its charge gage on terragon. I have seen times when i have
used the shakablad charge gage and krux has fallen over. This makes it so.. Easy to hit
him. But anyway. Krux has an attack that fires a beam out in front of him, which knocks
you over, yes? Well, if he knocks you over, stay lying down and any further shots will go
over your head. Basically just keep hitting him after your charge gages are depleted. If
by chance your charge gage fills up again, wait for the right moment and use it.
And by the way, if you're worried about the krawl killing your spectrobes before you get
to krux and terragon, here's an easy way out. There are three sections to the krawlosphere
before the krux and terragon area, and they are spoon shaped. The handle of the spoon and
the dip of the spoon both house separate battles. At one point in the dialogue, jeena
hints that you can go back at any time. So finish up the first spoon section, turn back,
and save. Then come back through and you won't have to fight those battles again. Then
finish the second spoon section, go back, and save. On the third one, beat the handle
section, and then go back and save. Don't do the dip of the spoon yet. Go back and save,
then come back and do the dip. Then you only have one battle between you and krux and
terragon, which means you are less likely to lose a spectrobe.