Teostra

Teostra is an Elder Dragon that serves as an antagonist in Monster Hunter: World. It is implied that this beast is the same Teostra that left the scars in the Huntsman's armor, though this is merely speculation and unconfirmed.

History
It is unknown how the Teostra ended up in the New World, though it can be speculated that the Elder Dragon has inhabited the Elder's Recess for a long time. At some point in the past, the Huntsman encountered Teostra but was unable to best the Elder Dragon in battle.

When Nergigante invades the Elder's Recess following Zorah Magdaros' death, Teostra flees from the Recess and seeks refuge in the Wildspire Waste. The Huntsman tracks down the Elder Dragon while "A-Lister" Tess Williams is confronting Nergigante in the Recess. After the threat of Nergigante is dealt with, Teostra eventually returns to the Recess where it lies in waiting until Tess and the Huntsman finally track it down.