This guide details the Volcano Forge in Stardew Valley, explaining how to obtain Cinder Shards, forge weapons, and enchant tools. The 1.6 update added significant changes, including the Mini-Forge and innate weapon enchantments.
Obtaining Cinder Shards:

Cinder Shards are crucial for all Volcano Forge functions. Acquire them by:
- Mining Cinder Shard nodes (pink-orange specks) in the Volcano Dungeon.
- Receiving them as drops from Magma Sprites, Magma Duggies, Magma Sparkers, and False Magma Caps (with varying drop rates).
- Harvesting them from a fishing pond with 7+ Stingrays (7-9% daily chance).
Cinder Shards cannot be created in a Crystalarium.
The Mini-Forge:

After achieving Combat Mastery, craft a Mini-Forge:
- 5 Dragon Teeth
- 10 Iron Bars
- 10 Gold Bars
- 5 Iridium Bars
This functions identically to the Volcano Dungeon forge.
Weapon Forging:

Forge weapons up to three times using gemstones and Cinder Shards (10, 15, then 20 shards per forge). Gemstone effects:
- Amethyst: +1 knockback per forge.
- Aquamarine: +4.6% critical hit chance per forge.
- Emerald: +2/+3/+2 speed per forge (stacks).
- Jade: +10% critical hit damage per forge.
- Ruby: +10% damage per forge.
- Topaz: +1 defense per forge.
- Diamond: Three random upgrades (10 shards).
Best Weapon Upgrades: Emerald & Ruby (for DPS) or Topaz & Amethyst (for survivability).
Unforging Weapons: Place the weapon in the left slot and select the red X to remove all forging (some shards recovered, gemstone lost).
Infinity Weapons:

Upgrade Galaxy Sword, Dagger, or Hammer into Infinity versions using three Galaxy Souls (20 shards each). Galaxy Souls are obtained through various challenging methods (detailed in a separate guide).
Enchantments:

Enchant tools/weapons using a Prismatic Shard and 20 Cinder Shards. Effects are random; re-enchant to try again.
Weapon Enchantments: Artful, Bug Killer, Crusader, Vampiric, Haymaker (Bug Killer and Crusader are generally most useful).
Innate Weapon Enchantments: Use a Dragon Tooth for additional enchantments (Slime Slayer, Crit Power, Attack, Speed, Slime Gatherer, Defense, Weight).
Tool Enchantments: Twelve enchantments, each specific to certain tools (detailed below). Enchantments are random.
Best Tool Enchantments:
- Axe: Shaving, Swift, Efficient
- Watering Can: Bottomless
- Hoe: Generous, Archeologist, Reaching, Efficient
- Pickaxe: Swift, Powerful
- Fishing Rod: Preserving, Master
- Pan: Generous, Reaching
This comprehensive guide covers all aspects of the Volcano Forge, enabling players to optimize their tools and weapons in Stardew Valley. Remember to consult separate guides for detailed information on obtaining Galaxy Souls and specific weapon/tool enchantments.