Hey Sharders,
We're a small indie team called Crimson Blade Interactive, and we're building a Mistborn action RPG in Unity. We've been referencing the incredible physics discussions on this forum (especially Phantine's Steel/Iron analysis) extensively, and figured this is the community to share with.
The Game:
Open-world action RPG set in Luthadel during the Final Empire era. You play as a Mistborn with all 16 metals fully implemented. Our Allomancy Physics (where we leaned heavily on this community's work):
We spent a lot of time on the 17th Shard archives getting the math right:
- Linear distance scaling — F = F_max × (1 − r/R), based on the community consensus here that inverse-square doesn't work for Vin's hover equilibrium. Linear gives a clean
mid-range balance point where push force equals weight.
- Force from the chest ("center of self"), not center of mass. Blue lines originate from the chest
- Full Newton's Third Law — mass ratios determine who moves. Push a coin and you barely move, it flies. Push a steel beam anchored to the ground and YOU launch.
Push
something your weight and you both move equally.
- Anchor quality scales with mass — effectiveRange = maxRange × (1 + log10(mass) × 0.5). A coin's line is faint at 10m. A steel beam is bright at 60m.
- Power-limited coin velocity — F(v) = min(F_max, P/v). This prevents hypersonic coins while explaining why fast bullets are hard to deflect (less force available at high velocity). Credits to the discussions here about why constant-force models break.
- MAG burn rates — Steel/Iron 20 min, Pewter 5 min, Tin 1 hr, Atium 30 sec, etc. All from the Mistborn Adventure Game.
- Arc trajectories — pushes at angles create smooth parabolic arcs. Force direction updates every frame as relative positions change. Diagonal steeljumps curve naturally under gravity.
- Center of mass targeting — push/pull targets the mathematical center of mass, even if it's in empty space (hollow rings, bent bars). Off-center pushes create torque.
- Official coin specs — Clip: 2cm copper, 3g. Boxing: 3cm brass, 15.5g. From the Shire Post Mint licensed coins. Vin's hover calibration (the math that validated our model):
F_max × (1 − r_hover/R) = m × g
At hover: F_max ≈ 1.5 kN (conservative, enough to launch at 1g), Vin at 40kg, hover at ~55 units out of 60 range. She hovers near max range with linear falloff — exactly what the books describe. Inverse-square would give infinite force at point blank and no stable hover.
Beyond Steel/Iron:
Pewter enhancement, Tin sensory boost with vignette effects, Bendalloy/Cadmium time bubbles, emotional Allomancy (Zinc riots, Brass soothes), full enhancement metals
(Duralumin full-reserve burst, Chromium contact leeching, Nicrosil target boosting), Atium future shadows, Gold/Electrum self-sight, Copper clouds, Bronze seeking.
The World:
Procedural Luthadel with Kredik Shaw (20+ spires), noble keeps, skaa quarters, canals with bridges, day/night cycle with ash-filtered sun based on latitude/declination
astronomy, and Preservation's mists rolling in every night with a subtle blue tint. Website: https://mistborn-game.netlify.app
We have enormous respect for Brandon's work and this community's analysis of it. Lore accuracy is the foundation of everything we're building. If we got any of the physics wrong, you all are the people who would know — we welcome corrections.
Looking forward to your thoughts.
— Crimson Blade Interactive
