Rust's Magic Item Formulae

+1 weapons

Prerequisites:

• proficiency in smith’s tools
• forge
• spell casting ability
• level 3

Effort:

• 20 days (8hours each)

Materials and Costs:

• 200 gp for weapon materials (ex. Iron, carbon, wood, leather, etc.)
• Azlianyte valued at ~200gp
• valued at ~100gp

Result:

• +1 Weapon
Weapon (any), uncommonYou have a +1 bonus to attack and damage rolls made with this magic weapon.

+2 weapons

Prerequisites:

• proficiency in smith’s tools
• forge
• spell casting ability
• level 6

Effort:

• 200 days (8hours each)

Materials and Costs:

• 3000 gp for weapon materials (ex. Iron, carbon, wood, leather, etc.)
• Azlianyte valued at ~1000gp
• bones of a powerful creature valued at ~2000gp

Result:

• +2 Weapon
Weapon (any), rareYou have a +2 bonus to attack and damage rolls made with this magic weapon.

+1 armour

Prerequisites:

• proficiency in smith’s tools
• forge
• spell casting ability
• level 7

Effort:

• 200 days (8hours each)

Materials and Costs:

• 4000 gp for weapon materials (ex. Iron, carbon, wood, leather, etc.)
• Azlianyte valued at ~1500gp
• dragon scale valued at ~1000gp

Result:

• +1 Armour
Armour (any metal), rareYou have a +1 bonus to AC

Sending Stone

Prerequisites:

• proficiency in tinker’s tools
• spell forge
• spell casting ability
• level 3

Effort:

• 20 days (8hours each)

Materials and Costs:

• 200 gp for misc materials (ex stone, inks )
• Azlianyte valued at ~100gp

Result:

• Two 26 word sending stones (1 pair)

Bag of Holding

Prerequisites:

• proficiency in leatherworker’s tools
• spell casting ability
• level 4

Effort:

• 20 days (8hours each)

Materials and Costs:

• 300 gp for misc materials (fabric, metal clasps)
• Azlianyte valued at ~200gp

Result:

• One standard bag of holding

Chicken Horse

Prerequisites:

• proficiency in tinker’s tools
• spell casting ability
• level 5

Effort:

• 36 days (8hours each)

Materials and Costs:

• 300 gp for misc materials (fabric, metal clasps)
• Azlianyte valued at ~200gp
• one live chicken
• fresh rainwater
• liquid mirth

Result:

• 1 horse summoning whistle with 1d6 uses

Repeating Shot

Prerequisites:

• proficiency in tinkers’ tools
• relevant tools for weapon crafting,
• spell casting ability
• artificer
• level 6
• forge

Effort:

• 200 days (8hours each)

Materials and Costs:

• 2000 gold pieces of misc material
• a weapon with the ammunition property
• 1000 gp azlianyte
• at least three pristine roc feathers (about 1000 gold pieces)
• 1000 gp crymlianyte

Result:

• Repeating Shot Weapon
• Counts as magical

Cape Of The Mountebank

Prerequisites:

• proficiency in tinkers’ tools
• proficiency in sewing tools
• spell casting ability
• level 6

Effort:

• 200 days (8hours each)

Materials and Costs:

• 2000 gp miscellaneous materials, sulfur, quality fabric
• 1000gp lianyte
• the hide of a blink dog 2000gp. Alternatively, the whisker of a blink kitten.

Result:

• Cape Of The Mountebank

Light of Truesight

Prerequisites:

• proficiency in tinkers’ tools
• spell casting ability
• level 11
• light and true seeing spells

Effort:

• 2000 days (8hours each)

Materials and Costs:

• 10000gp miscellaneous materials, quality glassmaking sand, oil, a firefly or phosphorescent moss
• 10000gp crimlianyte
• the eye of a beholder 5000 gold pieces
• ???

Result:

• Light of Truesight
The Orb of True Sight 

Note: Before you ask, the reason the sending stones are so much cheaper to buy and the bag of holding appears to sell at creation cost are because they are ‘mass produced’ to a degree. They are generally made by people/groups who have a specialized set up. The bags of holding and sending stones are the two most ‘common’ magic items in the world.