Ghostly blue platforms that break immediately - require DLC?

I am at the penultimate boss and trying to do a victory lap of the map but it seems like I'm missing an ability. There's a fifth (empty) ability slot in the menu and these blue glass platforms that I can't walk on without breaking them. Is this something I need the DLC for? I have been googling for an hour and I can't seem to find what I'm missing . . . Thanks in advance for any assistance.