Orb at Pyrite Peninsular (Malchor's Leap)
It’s an Orrian object, I think. Furthermore I think it was a power source like asuran ones, only more . . . aesthetically designed.
The only lore there is about it is in the nearby events and NPC dialogues.
Basically, it’s an unknown object of magical power that transforms any non-animals (so plants, soil, etc.) into gold-like metal. It is at the time that Malchor’s Leap takes place, incorruptible by Zhaitan – though the Pact fears it would be corrupted if they didn’t take it to safety. The Inquest try messing with it, and if they succeed they’ll embue its magic into a golem which patrols north-to-south of the eastern part of the zone, with some interesting lines (“Must protect Orr” amongst them, iirc).
Personally, it reminds me of the Hall of Heroes and Hall of Ascension and how that’s all gold.
The Blue Orb didn’t dispel miasma – it prevents those who die near it to become risen. This golden orb is different in that it changes things, rather than prevents change.
Since it’s a big ball o’ magic, it likely wouldn’t be useful against Mordremoth – seeing how any magic near its vines seem to be consumed.
Stop treating GW2 as a single story. Each Season and expansion should be their own story.