Manta

From WoWWiki

This article or section contains lore taken from Warcraft novels or short stories.

Manta, the Behemoth of the Deep, was a creature that was shot with an arrow covered in three drops of a black liquid from a vial. The arrow was used in a crossbow to kill Manta, a creature ten times the size and strength of a dragon. It was believed that, like Deathwing, the Manta was unstoppable.^{DotD 202}

It was said that the black liquid was used to kill this beast 100 years ago which is about 90 years before Warcraft I.^{DotD 201}

Some speculate that Manta was somehow linked to the Old Gods, but chances of that are low since four of the five Old Gods were chained beneath Azeroth (Possibly 3 now that C'thun may be dead) and the 5th God was slain with a sword.