Here's my opinion:

1: Avada Kedavra (Obviously)

2: Confringo (If this hits you, you legit explode bruh)

3: Deletrius (R.I.P Your atoms)

4: Firestorm (Dumbledore go brrrrrrrr)

5: FiendFyre (Yk why)

I will give a definition of these spells eventually.