Woa... Very well done. Excellent characterizations (loved the Filius - though I wonder how he could get to be 1/8th goblin if 4 generations were not allowed to have permanent relations as you noted) and action scenes. It is always good to see Snape taken down hard.
Good scene with Hermione and Daphne as well.
Author's response
- I should have explained better. Since his great grandmother (a biker babe type) strapped on a security goblin following a drunken Hogwarts graduation party, filius is the first in his line to manifest the Goblin stature. The others could all 'pass'...