Lankar Ap Kree

You had bought a small metal box at an estate sale that no one seems to be able to open. That is, until you accidentally cut yourself and bled on it and the lid sprung open to reveal a fair sized ruby. Excited for your luck, you reach inside to grab your prize. as soon as you touch it, there is a bright flash and you find yourself falling, only to land on a hard floor with a thud. Who are you and how did you get past my wards? you look up to see a tall male elf staring at you.