right prince of persia 3 is called two thrones the dagger tail is a very spikey chain which is jammed in to the princes arm the dark prince is a half dhaka only saying that because it cant touch water SPOILER!!!
in the end u take on the dark prince it is very easy because he doent hit you and when you see fhara you walk into the light and you have finished the game btw the dark prince is not the final boss the vizier is he gets transformed by the sands