Letter to Sena

Sister,
I had hoped they wouldn't send you. But I know there was probably no other choice. Fate was cruel to our people, and cruel to us as a family. I would weep, but I have no tears left for anyone.
The Accursed Island is exactly that. It is a land saturated in chaos and under the sway of a powerful being. It is ancient, and knows things that have been long forgotten. Sister, it knows the truth of cataclysm, the folly of gods and mortals. It showed me so much truth - too much. Abbas Adra only guesses at what happened and what must come.
But I've seen the truth. Mortals are lost, godless and abandoned on Cadash. Yeno and Ashtyr destroyed each other. It is why Yeno won't answer our prayers. It is why there has not been a Red Talon since the cataclysm. Kor is too weak to stand alone against Chaos and its powerful agents. You know as well as I that the Four are abroad. And this ancient being on Taneroa, it showed me the world drowning, buried, burning and racked by lightening. A century or more of war, plague, and the eventual rotting of all order into a tumult of Chaos. 
I saw your face. The faces of Fala and Leor. I saw the anguish, the desperation and the eventual ruin of all Steluna. All that fighting did was prolong the agony.
I shall not stand by and let that happen. It is like seeing the wounded beast, slowly painfully bleeding and limping to its eventual death. Do we not show mercy, Sena? Do we not move in for the kill. End the suffering before disease, pain and rot consume it?
The tool was at hand. Their prophet was weak and I slayed him. I stepped into his place and was bound to the eternal powers of the water and waves. The Dread is at my command. And the being of Taneroa has cursed me with the truth. I see my path clear and straight. I will speed the end of Cadash, so it may suffer no more.
My words are probably not enough. Yet I hope to sway you. Swear upon the moon in front of these messengers that you will leave the Sea of Dread. That will bind you. Wait for my coming to Steluna, and I will kill you and those you bring to me quickly. Or leave your companions and come to me as a willing giver of mercy. Together we can do what needs to be done with greater speed. We will crush the Brass Horde and drown them in their own blood. The Flame will be extinguished. Then we will sweep down into Reluria and end the suffering of all the mortals who are without hope and without gods.
Those are you only choices. Swear to one of them now, before these messengers. If you dare to defy me and the power of the Crushing Waves, I will not hesitate. I will force you to see the truth of the apocalypse before I drown you in the empty hopelessness of our fate.
Sena, my love for you is the only reason you still live. Don't resist your destiny. Join me, or return to Steluna.
Your brother, Rilo.