Items

From Kings of Legend-Wiki

Items increase your stats in two ways: according to a multiplier as well as by adding a fixed number of stat points. For example a Longsword will double your raw strength stat and add 10,000 to your strength stat, so if your raw strength is 5,000, equipping the Longsword will boost this stat to 20,000.

Upgrading items:
All items except rings can be upgraded to increase their stat boosts. Items are initially level 1 and can be upgraded with gems to a maximum of level 5.
Level 2 items have their multiplier increased by 50% for swords, gloves and amulets and by 20% for shields, armour, boots and helmets.
Level 3 items have their multiplier increased by 100% for swords, gloves and amulets and by 40% for shields, armour, boots and helmets.
Level 4 items have their multiplier increased by 200% for swords, gloves and amulets and by 70% for shields, armour, boots and helmets.
Level 5 items have their multiplier increased by 300% for swords, gloves and amulets and by 100% for shields, armour, boots and helmets.

In addition to this, items receive a base stat increase.
Level 2 items have their base stat increased by 100%.
Level 3 items have their base stat increased by 200%.
Level 4 items have their base stat increased by 300%.
Level 5 items have their base stat increased by 400%.

When downgrading an item, you will receive back half the gems that were used to upgrade.