In the Bar Fight quest on the 1st floor of the Three Old Kegs in Chapter Seven of Siege of Dragonspear, side with Autinn for Eadro's Blade +1, side with Lucilla for Cudgel of Montgomer +1. Alternatively, can be pickpocketed from him (same as Lucilla's weapon).
Description[]
“ | Legend has it that this elegant curving blade was forged deep beneath the sea by merfolk and its hilt bound in enchanted eelskin. The truth of the matter is more mundane. The blade was crafted in Iriaebor and given to a mercenary commander who protected cargo barges moving up and down the river Chionthar. Still, it is a finely made and serviceable weapon. | ” |