that's like the easiest mini boss in the whole game!!!!!i guess i'll tell you anyway....
just keep dodging his attacks and when able, hit him with a fully charged sword. after a
while, he should be dead. for your help, i'm gonna name the attacks and how to dodge
Fiery Spear:He shoots a green fire spear at you the way to dodge is to go between the
shots.Beam:a beam goes all the way across the room the way you dodge is go into one of the
two corners and just stay there until it stops(i mean upper corner,btw).Grab:he grabs you
and sucks you into a big thing of energy that drains your powers to dodge is to run away
from the arm if you get grabbed,struggle with the buttons until your free.Rock fall:he
grabs the walls and rocks fall from the sky you dodge by running away from the rocks or
breaking the rocks. when you do this,use the charge attacks a few times. hope this helps
:)

That was me back before I had an account =D(talking about above)