The Rune system is exclusive to Evolved PWI. Its based on Weapon Buffs (Passive and Active), which can be attached to your weapons for a certain period of time.
You can obtain the new Runes by doing Icebound Underworld (Guide), which is modified to drop aside of Glyph Packs also Rune items.
The runes are divided into 4 types:
Runes are separated into 2 categories:
You can craft the NEW runes at Runes Merchant - 528 661 Coordinates at West Archosaur City.
Rare, Epic and Legendary Runes can be obtained by doing Icebound Underworld Solo runs.
Perfect Runes (Perfector item) can only be obtained by doing Icebound Underworld Squad runs, and its necessary to have the Quest: Underworld Journey as the main rewarding Source.
The pack in the Underworld Journey quest can either give you:
As pre-announced, stacking 2 identical buffs WON'T work, we've beside the sheer technicality, also ensured within the Code, that it's not possible. Everything somebody might bring forward will be sheer placebo.
The Runes work only on Weapons with G16 or higher.