Flightstones are an item used in Dragonflight Season 2 to upgrade PvE gear, as mentioned in the initial context. They are required for all PvE item upgrades, ranging from Explorer 1/8 (i376) to Hero 5/5 (i441). The number of Flightstones needed for an upgrade depends on the item being upgraded and its item level. Generally, higher item levels require more Flightstones, with weapons typically requiring the most.

Flightstones can be obtained from various sources within the Dragonflight Season 2 content. These sources include:

1. Treasures: Discovering and looting treasure chests scattered throughout the Dragonflight Season 2 zones can reward Flightstones.

2. Quests: Completing quests in the Dragonflight Season 2 zones may grant Flightstones as quest rewards.

3. World Quests: Engaging in World Quests specific to Dragonflight Season 2 can yield Flightstones as rewards upon completion.

4. Rares and Rare Elites: Defeating rare or rare elite enemies in the Dragonflight Season 2 zones has a chance to drop Flightstones as loot.

5. Weekly Bosses: Participating in weekly boss encounters in Dragonflight Season 2 can reward Flightstones upon successful completion.

6. Fyrakk Assaults: Engaging in Fyrakk Assaults, special events or invasions in the Dragonflight Season 2 zones, can grant Flightstones as rewards.

7. Dungeons: Completing dungeons in the Dragonflight Season 2 content can provide Flightstones as rewards.

8. Mythic+: Participating in Mythic+ dungeons has a chance to reward Flightstones. Higher Mythic+ levels offer better chances of obtaining them.

It's important to note that the availability and amount of Flightstones from these sources may vary, with harder content generally rewarding more Flightstones. Additionally, Flightstones have no weekly or seasonal cap, but each character can only hold a maximum of 2,000 Flightstones at any given time, and they cannot be traded between characters.

Lastly, Flightstones are also used for upgrading crafted gear. An Empowered Flightstone can be purchased from Dustmonger Topuiz for 150 Flightstones. When combined with an Enchanted Shadowflame Crest, it can upgrade a crafted item to an item level between i395 and i447, depending on the rank of the Shadowflame Crest.