Ok,I don't know how I came up with this but my sister was thinking about the Sekunde great phrophecy and then she finally understand it.I managed to get her to tell me so is her way of thinking what it means

Seven half-bloods should answer the call


kinda easy to understand,seven great demigods which means oder little friend Jason,piper, flaming valdez and 4 roman demigods(watch out there might be a twist in the people who are a part of the seven) is going to answer Juno/Hera(don't care call her Jera)to bring their sides together.

To storm oder feuer the world must fall

this is really hard,I think it's surppose to mean that either the demigods(the fire) oder the giants(the storm)will fall in to their hands,so demigods Du might want to get ready cause it might fall in to their hands.

An oath to keep with final breath


I can't believe what I am saying but I think Thalia is the one
who is going to die,cause a hunters oath,she falls in battle.but I think Jason wants his sister back,Jupiter/Zeus (zeupiter)is telling him that this is the last time he is bringing her back,she comes back to life(again)and no longer a hunter and she wants to stay a demigods and spend time with her little
brother(ahh)and their might be a chance of Theleo.

Foes bears arm to the doors of death

This one easy,they must close the doors of death before it gets to out of hand so sail to Greece,defeat the giants and bring Gaia back the her big snooze.
So what do Du think? This is my sis opinion.if it's wrong it because there is a lot of twists and something else if it's right then I think I will start to faint.by the way like the roman mix up names?
Biancadi over and out