CWH Dragon

[Rocl]

If I'm remembering correctly, and casually reviewing summaries of the lore panel and my own memories, that would be Scarwing's Fall in the Coerthas Eastern Highlands.

You're also conflating Scarwing's Fall with the Weeping Vale & the Choke (which was Eastern Lowlands). The Weeping Vale was where a legion of Ishgardian knights sacrificed themselves to lure Dravanian ground troops to the Choke (an enclosed area) where Ishgard ambushed them. Scarwing's Fall, as best as I can guess from Ferne's impassioned speech) was a very earlier usage of what we know as "dragonkillers."