Sliske's Endgame is the end to a three year questline where a bunch of gods try to gain possession of the most powerful artifact in Runescape.
Here are some pictures I took for the guide but that I may not be putting into the quest guide.
The stone of jas is destroyed by the Dragonkin just as Zaros is about to gain possession of it
Jas is Sliske's master but I have no idea what that means
You kill sliske with the staff of armadyl but as you kill him he gains entrance into your body. You are the only person that knows he lives in you; everyone else thinks he is dead