Why is there a Panchashula instead of a Trishul in this temple of Shiva, Ravana is the reason?

Experts in Dharmashastras say that it is very auspicious to visit Baidyanath's Panchshul. It is believed that just by seeing it, Lord Shiva becomes happy and showers his grace on the devotees. Lord Shiva had told the method of making Pancha