How to texture a material with a different skybox?

I want to achieve the effect that guild wars has with his legendary greatswords like twilight

Is there a specific name for that effect? please help

360 view? but it requires specific texture for that with 360 view skybox.

But this is not a skybox materials, on looking how it behaves and how texture is being deformed, this looks like morel like screen space shader (screen coordinates used as UV) with camera space normal (orientation of pixel in space) and texture normals used as a offset of UV (screen UV + normals). Something along those lines