Sherekhan Necropolis is an intermediate grind-zone. Sherekhan mobs are primarily grinded for the infinite hp pot. The way the hp pot piece is obtained here is by looting dead mobs. The infinite pot allows you to infinitely replenish your hp without ever having to buy hp pots. The xp here is super low. With that being said, this spot is sub - par, you can grind Polly's for better, more profitable rewards. Polly's is also one of the best spots in the game for xp.
Sherekhan is located east of Duvencrune; Duvencrune is located South of Heidel, the Second major city in Black Desert.