Yaarel
🇮🇱 🇺🇦 He-Mage
Lets figure out a simple but realistic way to quantify obsidian weapons.
Crystalline blades, such as obsidian or quartz, are extremely sharp, but brittle.
A fresh crystalline blade deals an additional 1d6 slashing damage to the damage total. However, each natural 1 fumble on a d20 attack, dulls the blade and penalizes this damage by one more −1d6 from the damage total. If the minimum damage of the penalty, exceeds the maximum damage of the weapon type, the weapon is considered to be effectively destroyed.
You can spend a 1 hour short rest to attempt to repair a dull obsidian blade. You sharpen a crystalline rock by hitting it with a strong sharp rock that you can handle easily. Each impact at an angle typically causes a razor-sharp coin-sized clam-shaped chip to fly off. You can chip away to sculpt a serrated edge. Rudimentary tools are sufficient, essentially a suitable rock and a solid work area.
To repair a blade, each successful skill check removes a −1d6 penalty, until the +1d6 bonus returns. But each failed skill check inflicts a −1d6 penalty, until the weapon is destroyed.
Note, it is still possible to salvage fragments of a broken weapon to create a different kind of weapon that can make use of the smaller pieces. Even the small chips that fly off can be useful, such as small blades to cut or perforate hides for sewing, or so on.
Stone Knife: d4 slashing − hand-held rock with sharp edge
Stone Drill: d4 piercing − hand-held arrow-like wood, stone drill bit, can stab like dagger
Stone Dart: d4 piercing − arrow-like wood, stone arrowhead, flung with launcher (Atlatl)
Stone Axe: d6 slashing, throw
Stone Spear: d6 piercing, throw
Stone Edged Club (Macuahuitl): d6 slashing, versatile
− flat wood club, double-edged with teeth-like stone blades
Stone Arrow, Short Bow: d6 piercing, wood shaft, stone arrowhead, feather fletching
The above is base damage for weapon type, assuming blade of flint-like stone, or maybe horn or bone to pierce.
Wood may be scarce, bows rare and precious. Shafts can be bone or similar material.
Obsidian and quartz are extraordinarily sharp yet fragile. Such a rock-glass blade can only reach the size of a hand at the most. See above for possible uses for weapons.
If a stone weapon that slashes or pierces is made of fresh obsidian or quartz, increase the base damage die by one step up. For example, a Stone Edged Club used versatilely is base d8, thus steps up to d10 if the edge is fresh obsidian.
For each, natural 1 fumble to the d20 attack, decrease the damage die by one step down:
d12 → d10 → d8 → d6 → d5 → d4 → d3 → d2 → destroyed
You can use an 8-hour long rest (!) to try repair a damaged obsidian or quartz blade, by chipping away at its edge to reveal a new sharper edge. This process reduces the amount of stone left. (Compare sharpening a pencil.)
Do skill checks (ask DM, craft or knowledge). Each success increases the damage die by one step up, to a maximum of one above the base damage, thus refreshing it. Oppositely, each failure decreases the damage die by one step down, possibly destroying it.
The stone fragments of a destroyed weapon can be recycled to make a different kind of weapon, with a smaller blade.
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