Here's some more information, courtesy of the RuneScape Wikia:
Het is the desert god of health, both physical and mental, and is one of the four minor gods of the Menaphite Pantheon. A manifestation of Het can appear by picking up a canopic jar from Icthlarin's Little Helper. Het is probably the most worshipped of the minor Kharidian Desert gods, with great followings in each of the desert settlements. Al Kharid is particularity notable for this, with a majority of its citizens worshipping Het. However, he has lately come under the suspicion that he caused the Sophanem plague, due to Amascut twisting his power, in a manner similar to what she did to Apmeken. Notable followers of his include Ozan.
And to protect the Stone until such a time as, near to death, whereby you are relieved of all duties and shall henceforth be returned to your home plane with the gratitude and blessings of Guthix.