Dharok is one of the 6 Barrow brothers that defended a village against a dark army of sorts- They were victorious in every battle, but every time they tried to rest, some strange entity lurked nearby- This made them very uneasy.
The last battle they had again held off the darkness, but suffering severe wounds in the process. For some odd reason, their wounds would not heal- and right when the sun appeared, all 6 brothers perished in unison. They were given a proper burial, and that very night, the monsters came back and slaughtered the villagers one by one.
What happened was that strange entity had bestowed a curse on them, and now whenever you break into their tomb in-game, they'll attack you. They're incredibly dangerous, and even I hesitate to go there sometimes