Merlin Trials

Mallowsweet Leaves — Needed before you can start a Merlin trial [Steam Guide 2933583559]
Revelio — Helps locate what's needed to start a trial, though it doesn't work on light particles/fireflies which glow themselves [Steam Guide 2933583559]
Mallowsweet — Needed to unlock Merlin trials [Steam Guide 2956622193]

Accio — Used to move small or big balls to the holder [Steam Guide 2933583559]
Wingardium Leviosa — Used to move small or big balls to the holder [Steam Guide 2933583559]
Depulso — Used to move the big ball to the holder [Steam Guide 2933583559]
Lumos — Used to move light particles/fireflies to the crystals [Steam Guide 2933583559]
Reparo — Used to repair broken statues [Steam Guide 2933583559]
Flipendo — Used to flip the top block to match the pillar [Steam Guide 2933583559]
Confringo — Used to destroy blocks and light braziers within a few seconds of the first one [Steam Guide 2933583559]
Broom — Can be used to skip some platform-jumping challenges, but not all [Steam Guide 2933583559]
Basic Cast — Repeated fast casts can move the big ball, or can be used to destroy targets [Steam Guide 2933583559]

Flipendo Requires Revelio Required for Mallowsweet Required for