Curio of the Nine sources?

[heavy furnace]

Are there any sources to get those aside from seasonal challenges? I am trying to get every single one for when the season ends, for if its useful later

[frank pine]

Nope

Only seasonal challenges, they'll probably be used to acquire guaranteed adept rite of the nine guns if I add to guess

[heavy furnace]

Nice, otherwise I would have quite a bit more grinding to do haha

[heavy furnace]

yeah, some people speculate its for frontiers but its probably just for rite

[frank pine]

I doubt they would make a consumable from a season actually important for an expansion