Options, only one can be applied to a weapon at a time.... these effects can stack with eldritch rituals and festival enchants
Tier one upgrades (Named, random gen, and crafted items qualified)
1) Vampirism (melee only, no handwraps)
2) Wild Card (Becomes a set item piece of your choice)
3) +1 to the enhancement bonus on the weapon
4) Metaline
5) Aligned
Tier two upgrade (Named and crafted qualified unless there are already two augment slots on a weapon)
1) Red augment slot
2) Orange Augment Slot
3) Purple augment slot
Tier three upgrade (Only random generated and crafted items qualified)
+1 To Enhancement bonus (Sometimes, the weapon will not be qualified for this extra +1 enhancement), and now you are prompted to name the weapon.
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Use this same process on a weapon of 20+ and make it compatible with sentience through doing so....
Hence, a Legendary greensteel weapon with sentience, a thunderforged weapon with sentience etc.