Sliske quest series

Sliske's Countdown is a quest series revealed at RuneFest 2015 planned to start in 2016. It will centre around Sliske's plan to award the Stone of Jas to whomever kills the most gods - a contest started in Missing, Presumed Death - and his progress towards his endgame. There will be four quests in this series in total.

Nomad's Elegy
Nomad's Elegy will follow on from Dishonour among Thieves, and will feature Nomad. His plan to siphon every soul from all over Gielinor and its underworlds into the Soul Obelisk will see the player teaming up with Death, Icthlarin, and several dead characters to lay siege to Nomad and stop his plans.

Ballad of the Barrows Brothers
Ballad of the Barrows Brothers will be the second quest in the series. Focussed on the Barrows brothers and their previously unknown sister, the player will be searching for a way to break Sliske's hold on the siblings. It is hinted, however, that the Barrows sister may not wish to be freed from Sliske's curse.

Third quest
Nothing is known about the third quest currently.

Sliske's Endgame
Sliske's Endgame will be the series finale. It will be the culmination of his plan, reaching as far back as the Battle of Lumbridge. Sliske will call an end to his game and tally up the scores, inviting those who killed a god - Vorago and Armadyl at the time of announcement - to an event that is sure to be big and noticeable.

The event will react to the player's choices, both during it and from previous quests and events, and generate consequences that reach beyond the quest.