Mortal Shell 2 Tarforge Guide: How to Upgrade Weapons & Tarstones
🎯 TL;DR: The Tarforge in Marrow Keep upgrades your weapons and Tarstones. Hand Franz the Etching Needle to unlock Tarstone upgrading. Don't stress about "wasting" upgrades — every weapon scales identically.
1. Where It Is & What It Does
- Location: Marrow Keep
- Upgrades weapons (needs materials like Ventrium and Laterite, plus Coin)
- Upgrades Tarstones (up to level 4)
2. How to Unlock Tarstone Upgrading
- Find and hand Franz the Etching Needle
- Level 2 yields a Tarcore
- Level 3 costs 150 Gold + 6 Tarcore (net 3 after refunds)
3. Weapon Scaling — No Wasted Upgrades
Every weapon scales identically at the Tarforge. At +20, damage, stagger, elemental efficiency, crit chance, crit damage, and Resolve regen all climb from 1.0 to 2.0.
✅ No regrets: Because scaling is identical, there's no "ruined" weapon. Upgrade what you enjoy — the only real cost is the materials.
4. Upgrade Priority
- Commit to one main weapon — don't spread materials thin while testing
- Level the Tarstones you actually use — they gain levels by killing while equipped
- Save big material dumps for the weapon you'll carry into the late game
🎯 Bottom line: "Unlock upgrading with the Etching Needle, commit to one weapon, and don't worry about wasting upgrades."