Actually let me explain the term divine weapon :
Divine weapon is actually an ordinary weapon which would get 'divine' powers after chanting special mantras.
eg If we take an ordinary arrow and chant Varunas mantra it would become Varunastra and so on .
It is stated that Vrishaketu, Karnas son was the last person in the Earth to have the knowledge of such mantras for divine weapons . He was taught this by Arjun (after Kurukshetra war) . He promised Krishna that he would not disclose the mantra to any others. So with his death the knowledge of such mantras also perished . Hence we cannot find it any more.
These are given in various books.They vary depending upon the sources .There were 3-4 types of Pashupatastra.
A book in Marathi--Mantra Shastra by Shankaracharya Khare has given a few.Nothing happens after chanting them.This was sound power and since we do not know how to convert the same into other forms of energy,these mantras are useless.
Like any library, Hinduism Stack Exchange shares great information, but does not offer personalized advice, and does not take the place of seeking such advice from any Acharya, Pundit, astrologer, Guru or other trustworthy Counselor.