Fiendfyre

He is the one, in fact, who realizes that the Basilisk fang is a potential weapon against a Horcrux, and finishes the job right as everyone else is about to be consumed by the ravaging Fiendfyre.

And given that the wand Narcissa gave to Draco burned up in Crabbe's Fiendfyre accident in the Room of Requirement, he should have no wand either.

At the end of the movie, Grindelwald attempts to destroy Paris with a powerful curse similar to Fiendfyre.

In fact, Crabbe tried to ambush Harry and his friends in the Room of Requirement by casting the deadly Fiendfyre.

However, Crabbe (Goyle in film version) defies Draco's orders and attempts to kill the trio by casting the deadly Fiendfyre ; unable to control the spell, he dies in the blaze while the trio rescue Draco and Goyle (Zabini in film version).