The Shadow Of The Beast Quest Bug

I got the the Big Foot part,
the Big Foot goes through the cave and phase through everything,
i can't kill him like that.

 

If you're talking about the giant boss, it might help to press F3 B to show hitboxes. Giants have really wonky hitboxes where only their feet can be hit. If that's not the issue can you give a little more detail on the issue?

Also, getting on the bed is a good strategy for fighting the boss since he can't hit you when you're there.

 

It used to be get under the table or on top of the bed and attack. But, like you said, it phased through everything. I know that it can get to you when you are under the table by phasing through the table. I haven’t tried on top of the bed to see if that still works. But, yes aiming for the feet is what I’ve done to attack it.