In Dragonflight Season 2, Shadowflame Crest Fragments can be obtained from various sources. Here are some of the known sources for acquiring Shadowflame Crest Fragments:

1. Raids: Shadowflame Crest Fragments can be obtained as drops from bosses in raid encounters. Raid difficulty levels such as Normal, Heroic, and Mythic have different chances of dropping these fragments.

2. Mythic+ Dungeons: Completing Mythic+ dungeons has a chance to reward Shadowflame Crest Fragments. The higher the Mythic+ level, the better the chances of obtaining these fragments.

3. Weekly Bosses: Engaging in weekly boss encounters in Dragonflight Season 2 content can yield Shadowflame Crest Fragments as rewards.

4. World Quests: Certain World Quests in Dragonflight Season 2 may offer Shadowflame Crest Fragments as rewards upon completion. These quests are usually tied to the new content introduced in the season.

5. PvP Activities: Participating in PvP activities, such as Battlegrounds or Arena matches, may grant Shadowflame Crest Fragments as rewards. The availability and amount may vary depending on the PvP mode and your performance.

6. Treasure Chests: Discovering and opening treasure chests scattered throughout the Dragonflight Season 2 zones may occasionally provide Shadowflame Crest Fragments.

7. Rare and Rare Elite Encounters: Defeating rare or rare elite enemies in the Dragonflight Season 2 zones can grant Shadowflame Crest Fragments as loot rewards.

8. Fyrakk Assaults: Engaging in Fyrakk Assaults, which are special events or invasions in the Dragonflight Season 2 zones, can reward Shadowflame Crest Fragments upon successful completion.

Please note that this information is based on the provided context, which specifies Dragonflight Season 2. Future updates or changes to the game may introduce new sources or alter the availability of Shadowflame Crest Fragments.