Question: how to summon gahz'ranka vanilla?
Answer: To summon Gahz'ranka, you first need to get the right items. To the south of the temple where High Priestess Arlokk resides, you will find a ramp to the riverbank. By following the ramp, you will find an abandoned camp with some overturned jars and chairs that can be interacted with (the area is named Pagle's Pointe).