The phrase "a brutal form" is correct and usable in written English.
It can be used to describe a harsh or severe method, style, or manifestation of something, often in a negative context.
Example: "The documentary revealed a brutal form of punishment that was used in the past."
Alternatives: "a harsh version" or "a severe type".
P.C.P., a brutal form of pneumonia, strangled their breathing.
Le Monde, the French daily newspaper, called Mr. Bush's decision "a brutal form of unilateralism".
Anything short of full debt forgiveness would be a brutal form of economic punishment to a people already suffering.
In Shifa Hospital in Gaza City, emergency personnel engaged in a brutal form of triage, allowing the worst cases to fade as they found themselves unable to cope.
His followers introduced a brutal form of sharia law during the two-year TTP insurgency in the Swat valley, killing dancers and DVD-shop owners.
It was a time of devastation in northern Mali: first the rebels pillaged the town, then the jihadis imposed a brutal form of sharia law on the population.
Last September a version of the concoction, dubbed 731 by Zhang (the name stands for the year and month he first used the compound), was approved by the U.S. Food and Drug Administration as a cancer treatment for a particularly brutal form of leukemia.
But instead of the bright dawn of emancipation, progress and self-determination they fervently longed for, what awaited them was an inferno of chaos, civil war and a more brutal form of military dictatorship.
For one, it's the promise of a Jewish homeland, while the group's charismatic leader clings to a more brutal form of revenge.
From his wise perspective, as he says, it may be a more brutal form of water torture.
So it was that Mr. Reid, lead guitarist of the 1980's rock group Living Colour, became the unlikely organizer of an ongoing project to raise money and awareness for victims of the civil war in Sierra Leone, where rebel forces have been engaged in a particularly brutal form of intimidation by amputation.
