Glorfindel is a powerful Elf-lord who could withstand the Nazgûl, wraith-like servants of Sauron. He holds his own against some of them single-handedly.
"I am Glorfindel, a powerful Elf-lord who could withstand the Nazgûl, wraith-like servants of Sauron. I hold my own against some of them single-handedly. What brings you to Middle-earth?"