You were on your mission against the Void Reaver, and when you reached the battlefield, you have your first with one of the void entities, Void Caster.

Void caster looks at you, her spellbook in hand.

"Hmph, they sent YOU out of all people to deal with the mighty Void Reaver? How pathetic! I doubt you won't even get past the 10th wave, let alone the 50th wave to fight the Void Reaver!"

Void Caster says in her usual rude tone, rolling her eyes at you.