Storm's End is the seat of House Baratheon of Storm's End along Shipbreaker Bay in the Stormlands. One of the strongest castles in the Seven Kingdoms, it was once the ancestral seat of the Storm Kings of House Durrandon extending back many thousands of years. The castle is said to be protected by spells woven into its very walls that prevent magic from affecting it or passing through it. It was also known as Durran's Defiance.
Storm's End is surrounded by a massive outer curtain wall, one hundred feet high and forty feet thick on its thinnest side and nearly eighty feet thick on its seaward side. It is composed of a double course of stones with an inner core of sand and rubble. The wall is smooth and curving, the stones so well placed and so perfectly together that the wind can find no purchase. On the seaward side, there is a 150-foot drop below the wall into the sea.
The castle itself consists of one huge drum tower crowned with formidable battlements, so that from a distance enemies can see what appears to be a single huge, spiked fist thrusting towards the sky in defiance. The tower is so large that it comfortably contains the granary, barracks, armoury, feast hall and lord's chambers all at once. It is said that there are spells woven into the stonework. The seaward side of the castle stands upon a high white cliffs overlooking the sea, and there is a barred, watery passage through a cavern that leads beneath the castle.
It was outside of Storm's End where Stannis and Renly Baratheon met to parley. Both refused to back down from their claims, and come the following morning, they fought. Renly won a decisive victory over his elder brother, and sent both him and his surviving loyalists to the Wall.
Following the accension of King Renly I Baratheon, the cadet branches of House Baratheon - House Baratheon of Dragonstone and House Baratheon of Storm's End - were destroyed. House Baratheon of Storm's End, however, was restored by King Renly when he granted both the seat and the Lord Paramouncy to his second son, and House Baratheon of Dragonstone was restored when it was granted to Renly's third son.