Below are a list of upgrades available for all your items, both Essential and Non-Essential. Make sure you have the right materials and the full amount of rupees before upgrading though, or you can't upgrade.
Weapons and ShieldsItem: Cost: Damage: Amount: Usage: Sword and ShieldSwordsItem: Iron Sword
Cost: 200 Rupees, x5 Eldin Ore, x10 Amber Relic
Damage: 1 Heart Damage
Amount: Unlimited
Item: Tempered Sword
Cost: 500 Rupees, x10 Eldin Ore, x15 Amber Relic, x5 Lizard Tail
Damage: 1 1/2 Hearts Damage
Amount: Unlimited
Item: Gold Sword
Cost: 800 Rupees, x15 Eldin Ore, x20 Amber Relic, x10 Ornamental Skull, x5 Dusk Relic
Damage: 2 Hearts Damage
Amount: Unlimited
Item: Goddess Sword
Cost: 1000 Rupees, x20 Eldin Ore, x15 Golden Skull, x15 Dusk Relic, x10 Evil Crystal
Damage: 2 1/2 Hearts Damage
Amount: Unlimited
ShieldsItem: Braced Wooden Shield
Cost: 50 Rupees, x2 Amber Relic, x1 Monster Claw, x1 Jelly Blob
Amount: Unlimited
Usage: Defends against basic projectile attacks. Like Octorok Seeds, stopping enemies from touching you and stops electric attacks. But it wont stop fire, ice. Or beam/energy attacks.
Item: Reinforced Wooden Shield
Cost: 100 Rupees, x3 Amber Relic, x2 Monster Claw, x2 Tumbleweed, x1 Ornamental Skull
Amount: Unlimited
Usage: Defends against basic projectile attacks. Like Octorok Seeds, stopping enemies from touching you and stops electric attacks. But it wont stop fire, ice. Or beam/energy attacks.
Item: Basic Iron Shield
Cost: 300 Rupees
Amount: Unlimited
Usage: Defends against basic projectile attacks. Like Octorok Seeds, stopping enemies from touching you and stops fire attacks. But it wont stop electric, ice. Or beam/energy attacks.
Item: Braced Iron Shield
Cost: 350 Rupees, x2 Eldin Ore, x2 Monster Claw, x2 Ornamental Skull
Amount: Unlimited
Usage: Defends against advanced projectile and close-range attacks. Like Arrows and other weapons, stopping enemies from touching you and stops fire attacks. But it wont stop electric, ice. Or beam/energy attacks.
Item: Reinforced Iron Shield
Cost: 500 Rupees, x3 Eldin Ore, x3 Monster Claw, x3 Tumbleweed, x1 Blue Bird Feather
Amount: Unlimited
Usage: Defends against advanced projectile and close-range attacks. Like Arrows and other weapons, stopping enemies from touching you and stops fire attacks. But it wont stop electric, ice. Or beam/energy attacks.
Item: Basic Goddess Shield
Cost: 1000 Rupees
Amount: Unlimited
Usage: Defends against most projectile and close-range attacks. Like Arrows, Octorok Seeds, fire breath and other weapons, stopping enemies from touching you and stops electric, fire and ice attacks. But it wont stop beam/energy attacks.
Item: Braced Goddess Shield
Cost: 1200 Rupees, x3 Golden Skull, x1 Blue Bird Feather, x1 Dusk Relic
Amount: Unlimited
Usage: Defends against most projectile and close-range attacks. Like Arrows, Octorok Seeds, fire breath and other weapons, stopping enemies from touching you and stops electric, fire and ice attacks. But it wont stop beam/energy attacks.
Item: Reinforced Goddess Shield
Cost: 1500 Rupees, x4 Dusk Relic, x3 Blue Bird Feather, x3 Monster Horn, x1 Ancient Flower
Amount: Unlimited
Usage: Defends against most projectile and close-range attacks. Like Arrows, Octorok Seeds, fire breath and other weapons, stopping enemies from touching you and stops electric, fire and ice attacks. But it wont stop beam/energy attacks.
Two Handed SwordsItem: Iron Two Hander
Cost: 200 Rupees, x5 Eldin Ore, x10 Amber Relic
Damage: 1 Heart Damage
Amount: Unlimited
Item: Tempered Two Hander
Cost: 500 Rupees, x10 Eldin Ore, x15 Amber Relic, x5 Lizard Tail
Damage: 1 1/2 Hearts Damage
Amount: Unlimited
Item: Gold Two Hander
Cost: 800 Rupees, x15 Eldin Ore, x20 Amber Relic, x10 Ornamental Skull, x5 Dusk Relic
Damage: 2 Hearts Damage
Amount: Unlimited
Item: Goddess Two Hander
Cost: 1000 Rupees, x20 Eldin Ore, x15 Golden Skull, x15 Dusk Relic, x10 Evil Crystal
Damage: 2 1/2 Hearts Damage
Amount: Unlimited
Twin SwordsItem: Iron Twin Swords
Cost: 200 Rupees, x5 Eldin Ore, x10 Amber Relic
Damage: 1 Heart Damage
Amount: Unlimited
Item: Tempered Twin Swords
Cost: 500 Rupees, x10 Eldin Ore, x15 Amber Relic, x5 Lizard Tail
Damage: 1 1/2 Hearts Damage
Amount: Unlimited
Item: Gold Twin Swords
Cost: 800 Rupees, x15 Eldin Ore, x20 Amber Relic, x10 Ornamental Skull, x5 Dusk Relic
Damage: 2 Hearts Damage
Amount: Unlimited
Item: Goddess Twin Swords
Cost: 1000 Rupees, x20 Eldin Ore, x15 Golden Skull, x15 Dusk Relic, x10 Evil Crystal
Damage: 2 1/2 Hearts Damage
Amount: Unlimited
SpearsItem: Iron Spear
Cost: 200 Rupees, x5 Eldin Ore, x10 Amber Relic
Damage: 1 Heart Damage
Amount: Unlimited
Item: Tempered Spear
Cost: 500 Rupees, x10 Eldin Ore, x15 Amber Relic, x5 Lizard Tail
Damage: 1 1/2 Hearts Damage
Amount: Unlimited
Item: Gold Spear
Cost: 800 Rupees, x15 Eldin Ore, x20 Amber Relic, x10 Ornamental Skull, x5 Dusk Relic
Damage: 2 Hearts Damage
Amount: Unlimited
Item: Goddess Spear
Cost: 1000 Rupees, x20 Eldin Ore, x15 Golden Skull, x15 Dusk Relic, x10 Evil Crystal
Damage: 2 1/2 Hearts Damage
Amount: Unlimited
AxesItem: Iron Axe
Cost: 200 Rupees, x5 Eldin Ore, x10 Amber Relic
Damage: 1 Heart Damage
Amount: Unlimited
Item: Tempered Axe
Cost: 500 Rupees, x10 Eldin Ore, x15 Amber Relic, x5 Lizard Tail
Damage: 1 1/2 Hearts Damage
Amount: Unlimited
Item: Gold Axe
Cost: 800 Rupees, x15 Eldin Ore, x20 Amber Relic, x10 Ornamental Skull, x5 Dusk Relic
Damage: 2 Hearts Damage
Amount: Unlimited
Item: Goddess Axe
Cost: 1000 Rupees, x20 Eldin Ore, x15 Golden Skull, x15 Dusk Relic, x10 Evil Crystal
Damage: 2 1/2 Hearts Damage
Amount: Unlimited
CrossbowItem: Heavy Crossbow
Cost: 200 Rupees, x5 Eldin Ore, x10 Amber Relic
Damage: 1 Heart Damage
Amount: Unlimited
Usage: Has a tighter string and therefore does more damage with stronger bolts.
Item: Rapid Fire Crossbow
Cost: 500 Rupees, x10 Eldin Ore, x15 Amber Relic, x5 Lizard Tail
Damage: 1 1/2 Hearts Damage (Total)
Amount: Unlimited
Usage: It was given a reloading clamp, and therefore has a faster reload rate, meaning you can fire crossbows at a faster rate (2 Bolts per Post).
Item: Multi Shot Crossbow
Cost: 800 Rupees, x15 Eldin Ore, x20 Amber Relic, x10 Ornamental Skull, x5 Dusk Relic
Damage: 2 Hearts Damage (Total)
Amount: Unlimited
Usage: The Crossbow can now fire multiple bolts at once. You can fire 3 bolts at the same time, two times per post.
Item: Goddess Crossbow
Cost: 1000 Rupees, x20 Eldin Ore, x15 Golden Skull, x15 Dusk Relic, x10 Evil Crystal
Damage: 2 1/2 Hearts Damage (Total)
Amount: Unlimited
Usage: This is the strongest crossbow their is. It has increased damage, and fires three bolts at once, twice per post.
Main Items and WeaponsItem: Magic Boomerang
Cost: 500 Rupees, x2 Evil Crystals, x1 Ancient Flower, x5 Tumbleweed
Damage: 1 Heart Damage + Stun Enemies for 4 Posts
Amount: Unlimited
Usage: Use it to stun your enemies and even do a bit of damage now.
Item: Big Bug Net
Cost: 100 Rupees, x3 Tumbleweed, x2 Ancient Flower, x1 Evil Crystal
Amount: Unlimited
Usage: Catches more fairies, birds and bugs than before. It's bigger net and rim means that more can be caught at once.
Item: Iron Bow
Cost: 300 Rupees, x3 Monster Claw, x3 Tumbleweed, x2 Eldin Ore, x1 Evil Crystal
Damage: 1 Heart Damage
Amount: Unlimited
Usage: Use it to shoot arrows faster, further and with more force than before, meaning more damage.
Item: Sacred Bow
Cost: 500 Rupees, x5 Tumbleweed, x3 Lizard Tail, x2 Evil Crystal, x1 Goddess Plum
Damage: 2 Hearts Damage
Amount: Unlimited
Usage: Shoot three arrows at top speed at your opponents now! The entire thing does two hearts damage too, nice!
Adventure Pouch ItemsItem: Extra Deku Seed Satchel Lvl. 2
Cost: 50 Rupees, x4 Amber Relic, x3 Monster Claw, x3 Ornamental Skull
Amount: Unlimited
Usage: Use it to store a total of 20 Extra Deku Seed Bullets, that's 10 more than the level before!
Item: Extra Deku Seed Satchel Lvl. 3
Cost: 100 Rupees, x5 Amber Relic, x2 Monster Claw, x1 Golden Skull, x1 Blue Bird Feather
Amount: Unlimited
Usage: Use it to store a total of 30 Extra Deku Seed Bullets, that's 10 more than the level before!
Item: Extra Bomb Bag Lvl. 2
Cost: 50 Rupees, x3 Ornamental Skull, x1 Blue Bird Feather, x1 Lizard Tail
Amount: Unlimited
Usage: Use it to store a total of 20 Extra Bombs, that's 10 more than the level before!
Item: Extra Bomb Bag Lvl. 3
Cost: 100 Rupees, x4 Jelly Blob, x3 Lizard Tail, x2 Hornet Larvae, x1 Golden Skull
Amount: Unlimited
Usage: Use it to store a total of 30 Extra Bombs, that's 10 more than the level before!
Item: Extra Quiver Lvl. 2
Cost: 50 Rupees, x5 Amber Relic, x3 Dusk Relic, x3 Monster Horn
Amount: Unlimited
Usage: Use it to store a total of 20 Extra Arrows, that's 10 more than the level before!
Item: Extra Quiver Lvl. 3
Cost: 100 Rupees, x3 Dusk Relic, x2 Monster Horn, x1 Goddess Plume, x1 Golden Skull
Amount: Unlimited
Usage: Use it to store a total of 30 Extra Bombs, that's 10 more than the level before!