Benyar said he needed Power Shards to improve the attack power of the Watch so they wouldn't be dependent on unreliable Daevas. The necessary materials were only obtainable at Alukina's Palace, where only Daevas can go, so he sought your help. You went to Alukina's Palace, defeated the Seafoam Spirits, Seafoam Spirits, and Undertow Obscuras, and collected the Bright Soul Pieces. Benyar was grateful for your assistance.