Oh man, this thing looks ******.
This fight can also be split into two phases, so let's go ahead and do so.
PHASE 1:
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To start the fight out, the orb will *always* suck you in. When he does this you will lose the majority of your relics and will be pushed back quite a ways. This is very concerning the first time you see it but there's nothing you can do.
We need to get our relics back. Head forward and start running at an angle (left or right, it doesn't matter). The orb is going to shoot green relics at us, but by staying at an angle we can avoid them. You can return to running straight at the relics in between shots as his shots are very telegraphed. Once you pick up your relics you'll regain your entire size but he will push you away at the same time(it doesn't hurt you at least).
Next he will pull out his sword again. This is much like previous sword attacks, the only difference is that green sparks will be attacking on and off without him directly controlling them. Still, you need to position yourself after he does his second attack so you can get a good combo in.
Once you've got some hits in he will stop and start floating. He surrounds himself with an energy here and should just be avoided. He will still be shooting green energy at you, will summon fire and will at the end start throwing out purple bombs. Just keep running around the area avoiding him and his attacks and soon he will stop and start the second phase of the fight.
PHASE 2:
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The boss starts this phase much like the last one: by sucking you in and making you lose the vast majority of your relic parts. He ups the ante here though by also summoning four giant guardians.
Oh man, this is rough. Rough but not impossible. Head straight for the relics and only go diagonal when he shoots at you. When you run into the first two guardians (and you will), they will do a smash attack. You want to just jump when they do this (so you don't get hit) then ignore them and make for your relics again. You need to get there quickly.
Once you gain your relics he will shield himself again and drive you back, which also kills off the guardians. He will go back to sword mode now. Here you need to repeat your attack from above. This is it! Use your super power here and/or attack him after his area sword attack to finish this.
Congratulations on beating Knack!
Thanks. This part was really tickin me off. Beat in 1 try after reading
If u use his attacks to destroy the Guardians he summons its a lot easier then avoiding them
Attack him with your superpower? U have 3 of them, which one are u referring to? which one does the most damage?