Mining & Smithing - Armor Spikes ("Smithing Overload") Design

As promised in the livestream you didn't watch yesterday because of some nonsense about Smash Bros, here's a simple design for the "smithing overload" we've been talking about for quite a while now without saying what it is.

• TLDR you make armour spikes which damage enemies that attack you.

Full design here.

At the moment we haven't specified how much damage the spikes will do per hit. (I have a number in mind but we need to playtest it first.) I'd be very interested in your opinion of how much damage would make it "worth it". (Note: the damage would be a flat number (or some multiple of your smithing level) - it doesn't scale with the enemy damage.)

(If you're wondering how much an elder rune bar will cost, with current balancing you can mine enough ore for 30-40 bars per hour.)

EDIT

Document updated with changes.