Do-ya Wanna Manta?

Overview
Scour the Torden Plains for the Plains Devil Lord. There is no exact location for this mythical beast, so pay attention to your surroundings and hope you're not alone, because it might just find you! Once the Plains Devil Lord is killed, return to Miru in Irendas Colony..

Kill the Plains Devil Lord
Scour Torden Plains and kill the giant Beam Manta called the Plains Devil Lord.
 * Plains Devil Lord Killed 1/1

Briefing
Master Salvager Miru:
 * The Plains Devil Lord has caused many Brann to lose their lives. Now it is time for it to lose its life.

If I were a more adept combatant, I'd kill the giant Beam Manta myself. But I'm no warrior. You... you're a fine warrior. So I ask of you, AFS soldier, go out and kill the giant Beam Manta we call the Plains Devil Lord. I don't know exactly where in the Plains it is, but I'm sure you'll stumble across it eventually. But when you find it, kill it!

Return to me with the good news of its death.

Debriefing
Master Salvager Miru:
 * I see I've placed my faith in you well, soldier. Thank you for killing this most dreaded beast.

Walkthrough
For locations and strategy, see: Plains Devil Lord