My Hope is Lost (Sadstuck EriKar Matesprit FanFic)

In a doomed timeline, Eridan Ampora and Karkat Vantas were Matesprits. After the two reach God Tier they set off to find their fellows. After joining the other trolls something horrible happens to the Knight of Blood.
He goes missing and his body is later found, bloodied by an unnamed killer. Broken by the death of his Matesprit, Eridan goes insane, with his last lingering hope, Karkat, dead. Only a single thought repeats itself in the back of the Prince of Hope's mind.
My hope is lost.