Before being retired, these seals could be earned from Queue System's Random: Trail Queue follow-up runs 50, Random: Epic Dungeon Queue follow-up runs 90, Random: Skirmish Queue 60 while a follow-up run 20, and finally Random: Dungeon Queue 45 while a follow-up run 15.
Lair of the Mad Mage and Tower of the Mad Mage granted 40 per boss (not including Halaster), and 70 per chest.
Master Expeditions: minor bosses dropped 10, while the major ones dropped 15. Handing in the quest granted 30.
Warden Expeditions: any bosses from Undermountain Expeditions dropped the same seals while unique bosses to Warden Expeditions dropped 20.
Fragment Expeditions: any bosses from Undermountain Expeditions dropped the same seals while unique bosses to Warden Expeditions dropped 20, and the final bosses dropped 50.
Undermountain Expeditions all have a chance spawn of a boss where the mobs groups spawn, these ones gave 25.
The Rare Monster Oddments found throughout Vallenhas would drop either 15 or 20 depending on the monster.
Rage of Bel Insurgences granted 1–11(Could be more if fully solo'd) per boss kill, also if you are weekly capped on you gained 10 from the Heroic Encounter reward.