You get it by defeating an Anemo Hypostasis (level 30 or above).

Typical locations for the Anemo Hypostasis are in the Mondstadt region (for example, in Stormbearer Mountains / Stormterror’s Lair area).

Use and context:

Hurricane Seed is a character-ascension material.

It’s considered a standard ascension material — when you need to ascend certain Anemo characters (or use related materials), it’s one of the components.

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