Random Drop from Mythic+

It seems that you can get your  Splintered Spark of Awakening as a random drop from the end of dungeon.

Weekly Quest in Season 4

Season 4 of Dragonflight includes a new  Splintered Spark of Awakening and  Spark of Awakening for crafting! In order to get this, you can complete the weekly open world quest from the Dragon Isles Emissary, Therazal in Valdrakken.

This quest will change from week to week between Amirdrassil, Zaralek Caverns and the Dragon Isles.

Dragon Isles Quest

Here is the Dragon Isles quest,  Last Hurrah: Dragon Isles.

• Complete the Community Feast
• Complete a Hunt
• Complete the Siege of Dragonbane Keep

Zaralek Cavern Quest

Here is the Zaralek Cavern quest,  Last Hurrah: Zaralek Caverns and Time Rifts.

• Complete the Researchers Under Fire event
• Loot a Secured Shipment from a Suffusion Camp
• Complete a Time Rift

Amirdrassil Quest

This quest requires players to obtain:

• 100  Dreamsurge Coalescence from the active Dreamsurge
• 50 Bloom from the Superbloom event
• Complete 1 Superbloom
• Plant 3 Dreamseeds in the Emerald Dream

Rewards

The rewards for completing this quest are:

•  Weekly Awakened Activity – Completing this quest can reward you with a weekly spark for crafting.
  You have already received your weekly spark for crafting this week.
  You have not received your weekly spark for crafting this week.
•  Cache of Awakened Dreams – Contains a random piece of Champion gear, gold, and equipment upgrade materials.