Hesy-su-neb-ef - Ancestral Guardian is a Tomb Guardian hero monster and part of the side quest The Missing Brother. He is found in the unnamed tomb to the east of the Giza Plateau.
Hesy-su-neb-ef can be a fairly dangerous enemy, as he is fast, has a lot of health and two powerful attacks, a regular melee attack and an area effect flame attack. Boost your fire and piercing resistances and use lots of potions, if you have trouble beating him. Also, the large door won't close, offering the chance of a quick escape, if need be.