Beastmaster III: The Eye of Braxus.

Before he died, Dar's father gave a mysterious amulet to Tal, Dar's younger brother who is now king. Dar, while wandering with his animal companions, chances to meet and rescue a family who seek the help of King Tal against Lord Agon, a sorcerer who has conquered their land. Dar obtains an audience for them with Tal, who rallies his troops to march against Agon in the morning. Alas, the young king is captured by Agon's crimson warriors during the night.