Three Words too long, but I need every one of them…
Armamentarium - 1.A fruitful source of devices or materials available or used for an undertaking.2. The aggregate of equipment, methods, and techniques available to one for carrying out one's duties.
Barty Crouch Junior had any number of methods of torture or interrogation available to him. The Imperius Curse, the Cruciatus Curse and Veritaserum among them.
But he could never see the point. What was the use of repeated torture? Either the victim would refuse to tell him anything, or they'd conjure up some cock-and-bull story. Anything to stop the pain.
And you could only do it a certain amount. Otherwise they became useless. Bellatrix had proved that with the Longbottoms.
What Barty found most useful was keeping his opponents drugged; stealing their genes for Polyjuice Potion. Masquerading as the enemy yielded untold secrets.