UPDATE: Lord Seymour has been spotted back in the courtyard of Castle Britannia as part of the new Quest for the Lord's Boon from the recent patch outlined here: https://shardsofbritannia.com/news/upcoming-balancing-improvements

Tips:

• You can hunt for the Undead Crystals in all of the graveyards and they have a chance to drop on all of the monsters
• Wraiths can be found at all of the graveyards

Fix:

• The Lord's Boon cast time has been corrected from 6s to 2s as expected; 6s was the default cast time for the Legends of Aria hearthstone, and as we advertised Lord's Boon to be a 'Recall' it now matches the Recall spell cast time