The Stormveil Castle area has only two Ashes of War to discover. This page details where to find both Ash of War: Stormcaller and Ash of War: Storm Assault.
All Ashes of War Locations in Stormveil Castle
|Ash of War: Stormcaller||Dropped by a Teardrop Scarab located southwest from the Secluded Cell Site of Grace|
|Ash of War: Storm Assault||Dropped from a Teardrop Scarab beneath the Rampart Tower in the western part of Stormveil Castle|
Ash of War: Stormcaller
This one is incredibly easy to find once you’ve located the Secluded Cell Site of Grace. As you spawn at the site, head southwest up the ramp. You’ll find the Teardrop Scarab waiting here, but you’ll need to be quick to kill it as it will disappear within a few seconds. If this happens, you can pass time at the Site of Grace to force it to spawn again.
Ash of War: Storm Assault
The Teardrop Scarab which drops the Storm Assault Ash of War is in the same location as the Crucible Knight who drops the Aspects of the Crucible: Horns Incantation. The scarab is located directly beneath the breakable ledge, as shown in the gif below.