I have done everything in the crypt even found a new sword, helmet, and shield. but i have to deliver barrenhawks package for the quest, and I cannot find the entrance to Ishad N' Ha, or the serpent temple, and that is where i'm supposed to go next to kill some evil priest for another quest. please help anyone i'm getting frustrated.

As long as you got the Holy Signet ring, follow the river north until you find the cave with the 3 Oracles. If you have the Signet, they will open the entire cave to you.