Infested Necroray

Necrorays lay their eggs in small clusters within the frills and hollows of decaying fungal blooms.

Riding Requirements:

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

Source:

Necroray Egg from Tribute of the Ambitious.
Necroray Egg from Tribute of the Duty-Bound.

Notes:

This manaray mount is one of three that may hatch from a Necroray Egg, which is an extremely rare reward from the chests you receive for completing your Covenant's 'Calling' quests for Maldraxxus: see Tribute of the Ambitious or Tribute of the Duty-Bound. A new Calling quest is offered every day from your Covenant base in the Shadowlands, but Maldraxxus ones appear on average once every 4-5 days. Your Covenant affiliation doesn't appear to matter.

Much like the Primal Egg in Pandaria, you must hold on to the Necroray Egg for three days, after which time it turns into an Oozing Necroray Egg which can be opened.