For Example, here's mine! (If someone finds this who has the power to make it happen, I give you 100% rights to the idea without need or desire for reimbursement and consider this statement to be a binding contract to signify such)
(Weapon takes the Shape you ask it to take but is limited to melee weapons and can only take a shape once, unless you feed it a heart of wood at a Weapon Master (Any heart will do)(New NPC))
Level 4
Lesser Vampirism Unlocked, weapon becomes +3
Level 7
Lesser Vampirism becomes Vampirism, Lesser Entropy Added (See Entropic), Weapon becomes +5
Level 11
Lesser Thieve's Envy Added (I came up with this, basically it would work something like trap the soul but have a chance of turning an enemy into a useful item. Examples;Spell Point potion, rare collectibles, a small stack of healing potions, a soul gem... etc. and ideally the list would improve as the tier of quality for Thieve's Envy would improve and eventually the more you use an item for crafting or for adventuring, the more likely such will be a drop you get, hence you might be rewarded by the weapon for buying and using massive stacks of experience potions, or simply crafting and recrafting the same gear stats onto equipment)
Level 15
Weapon becomes +7, Lesser Thieves Envy becomes Thieves Envy (drops and drop chances improve), Vampirism becomes improved Vampirism, Lesser Entropy Becomes Entropic, Bleeding effect Added
Level 20
Weapon Becomes +9, red augment slot added, Life Stealing is added, Armor Piercing 15% added
Level 24
Weapon becomes +11, Vampirism becomes Superior Vampirism, Banshee's Guard (There's now a 50% chance that this weapon will cast Wail of The Banshee when an enemy hits you with a critical spell or attack). Armor Piercing 15% becomes exceptional armor piercing 15%
Level 26
Purple Augment Slot added, constitution damage added, Immobilizing Curse added (Has a 7% chance on hit to cast paralysis, stone prison, flesh to stone, hold monster, or Otto's Irresistable Dance)
Level 28
Weapon becomes +13, Thieve's Envy Becomes Improved thieve's Envy, bleeding effect improved
Level 30
Weapon becomes +15, Improved Thieve's Envy becomes Superior Thieve's Envy
Final Weapon has the following
+15
Superior Thieve's Envy
Superior Vampirism
Banshee's Guard
Entropic
Improved Bleeding
Life Steeling
Immobilizing Curse
Exceptional Armor Piercing +15%
Red Augment
Purple Augment
If the list of benefits is too long then the following can be added to an augment that serves as a sort of proof of ownership the weapon would acknowledge
Banshee's Guard
Exceptional Armor Piercing +15%
Life Stealing