The Weyc's Oracular Focus

 is a small shield in.

Acquisition

 * Heldr's Inheritance is the chest with four torches around it, on the bridge between the Trephine and the door leading to The Central Stacks.
 * To open it, you need to find two items:
 * Memoirs of Heldr: Located in The Oratory of Wael.
 * Heldr's Horn: Located in The Assembly of Echoes.
 * These items can be found during the related quests listed.
 * Put the Memoirs on the Lectern of Obfuscation, and throw the Horn in the Incinerator.
 * This will light the torches aound the chest, allowing you to open it and claim your shiny new shield.
 * This is needed for the achievement One of Them.

Upgrades

 * Note: Strengthened Enlarge Shield / Varied Large Shield and Greater Channeled Shield / Lasting Channeled Shield are mutually exclusive.