Include missing Warden’s Signets and arcanums in enchant choices

Find applicable gear enchants missing from the builder, including Warden’s Signets and newer Zul’Gurub arcanums such as Presence of Might. We plan to connect each supported enchant to the item that applies it.

The choice will appear for the correct equipment slot with available source information. Unobtainable placeholder entries will stay out, so additional coverage does not become a misleading list of options.