A very, very big axe in this cosplay by Tarah-Rex, photographed by Micktography.
I'd say this is more How To Train Your Dragon 2 Astrid, but either way the costume is great and the expression on her face perfect for the character.
I like the photograph too. My only quibble is the over-exposure of the sky which leads to her hair blending into it. I'm not sure if that was deliberate artistic intent, but I don't care for it either way.
Source: Facebook - Micktography: Astrid