The layout, well done. The math, solid. The Armorer's Handbook, well worth it. Sticking to the simplicity of 5e while still expanding and adding ways for character's to invest in their equipment, with meaningful results and desireable outcomes, this is an absolute must-have. The Rune magic system, carried down in tradition from the Giants of old, provides a bridge between the mundane equipment of the lower levels to the powerful magic weapons and armor of legendary heros at the later levels. Giving players a way to be active in their pursuit of cool gear and increase their agency in a game which is just as much theirs as it is the DMs is only part of what makes this a great product. The execution, presentation, and research poured into this product shows, from its design to the carefully presented and balanced upgrade system.
I cannot express all the things I enjoy about this product, and I am glad to see it jump from Mithril to Adamantine. I am excited for more products from Heavyarms and what they will bring to my table next.