This is a support quest for Two Knives Against the Dark quest.
With all the might and cunning he'd become known for, Alexios dealt with Amorges's forces in Messenia and needed to reconvene with his ally, Darius.
The Trap Is Set
Objectives of The Trap Is Set
1. Return to Darius
Pebble or another helot child will bring you the Mysterius Letter.
2. Quest Completed
Rewards: Legendary XP, Order Soldier's Axe (Epic Heavy Bladed), An Invitation to the Eagle Bearer (Ancient Clue), A Given Name (Ancient Clue), Mysterious Letter (Quest Item).