Is he on his 2nd phase when hes on the ground? If so you have to run past him and force him to use his claw attack, but it will miss and quickly get behind him and use your Third Eye and you will see 3 glyphs on his back, you have to take out all 3 by purifying them.
When this is done he is vulnerable again, and you can go back to using your Kila and hit him about 12 times, luckily your health won't fall like before. After 12 hits he falls to the ground and an item shows itself, you have to quickly run and get the item or else you have to use the Kila 12 times again.
yes my problem is I cam't get to that item in time, evry time it shows up I'm to far away from it to pick it up. guess I just have to keep trying even though I am tired of doing this over and over. If I beat this boss is it the end of the game?????