help with a Merlin trial? just need a clue to what to do

[lime surge]

I already put the mallow sweet leaves down

[full valley]

You'll need to either push a large round boulder off a precipice, or roll it down a hill, or levitate it with Wingardium Leviosa, into that hole.

[lime surge]

Okay tysm I have a feeling that was it do you know where the boulder would be?

[full valley]

It should glow blue if you use Revelio and look around.

[lime surge]

Found it!!