Hecate was a very powerful demon from the underworld along with her minions, Hecate comes to earth in every 200 years to find an innocent man from a well-born family and marry him and have a baby. She did this to Allison Michaels when Allison was about to get married to Elliot Spencer she reminded Grace Spencer that they made a deal 20 years ago. Jade made Elliot under her control and made herself the bride instead. When Phoebe and Piper Halliwell was catering in the wedding, Father Trask warns them about Hecate but later that day Hecate's Minion killed Father Trask and threw him in the window so they could think that he fell from the window.
True Love Of Elliot and Allison
Knowing that a declaration of love can break Hecate's spell, the sisters contracted Allison and convinced her to crash Jade/Hecate's wedding. When Allison declared her love for Elliot Hecate conjured a storm and ran off with Elliot. The sisters followed them to the bedroom, followed by bridesmaids. The sisters tried to vanquish Hecate, though Prue couldn't find the poignard. Elliot then found the poignard and picked it up He raised the blade and Prue telekinetically drew Hecate and the bridesmaids into it, banishing them back to the underworld.
