The second, more complicated system in LessPop_MoreFizz's answerLessPop_MoreFizz's answer has changed with the Shadow of Revan expansion (Patch 3.0). It still holds true for "old" schematics (skill levels 1-450), but there is a new and slightly simpler system for schematics over 450. It reduces the number of Purple/Artifact items from 14 to 9, eliminating 5 items that added both tank and DPS secondary/tertiary stats to the base item. (Note that it is still possible to add tank stats to a DPS base item and vice versa, but both types can never be added to any base item.)
Green/Premium items can be Reversed Engineered to learn Blue/Prototype items with increased Mainstat and Endurance:
- Fervor (additionally increases Crit and Accuracy)
- Expert (additionally increases Power and Surge)
- Veracity (additionally increase Defense and Shield)
Unlike the old system each of these prefixes is re-used for the highest tier, but it should not be confusing because it adds the same stats each time.
Fervor Blue/Prototype items can be RE'd to learn Purple/Artifact items with further increased Crit, Mainstat, and Endurance:
- Fervor (increases Accuracy further than the previous tier)
- Supremacy (removes the Accuracy added in the previous tier; increases Alacrity)
- Endowment (removes the Accuracy added in the previous tier; increases Surge)
Expert Blue/Prototype items can be RE'd to learn Purple/Artifact items with further increased Power, Mainstat, and Endurance:
- Expert (increases Surge further than the previous tier)
- Hawkeye (removes the Surge added in the previous tier; increases Accuracy)
- Vehemence (removes the Surge added in the previous tier; increases Alacrity)
Veracity Blue/Prototype items can be RE'd to learn Purple/Artifact items with further increased Defense, Mainstat, and Endurance:
- Veracity (increases Shield further than the previous tier)
- Shielded (removes the Shield added in the previous tier; increases Absorb)
- Exactitude (removes the Shield added in the previous tier; increases Accuracy)