The Keystone Citadel - Planetarium Element | Side quests Lords of the Fallen Guide

Antanas is one mysterious man.

After the fight with the Beast collect the Planetarium Element [M2.20], which you find to the right of the main entrance to the Citadel. Then, head towards the Planetarium, to talk to Antanas [M5.5]. Return the item, thanks to which you receive several nebulous hints on the last two opponents, as well as 1500 EXP.