You must first complete the <a href="https://legendhub.org/quests/details.html?id=147">elite guardsman quest</a>. Buy a mirror from the Smithy in Romania. Find the king's brother in the Reflective Bedroom -- GIVE MIRROR BROTHER. The brother will give a note to you. Go to General Gales -- GIVE NOTE GALES. He will lead you to the throne room and kill the king . You receive EXP.
credit: <a href="http://www.legenddb.com">legenddb</a>