Battlefield Swarmer

Corpseflies are strongly attracted to the smell of dead bodies and will swarm an active battlefield as soon as the first corpse falls.

Riding Requirements:

This mount is available to all eligible characters on your account.
Level 10
Apprentice Riding (ground)
Expert Riding (flying)
Necrolord Covenant only

Source:

Achievement: On the Offensive
Duchess Mynx in Keeper's Respite, Korthia.
Cost: 1000

Notes:

This green corpsefly with striking copper wings can be purchased from Duchess Mynx in Korthia, but only after completing the achievement, On the Offensive. This is a meta-achievement for activities related to covenant assaults on the Maw in patch 9.1.