Stella Fortuna are Constellation Activation Material items used to activate the Constellations of playable characters, except for the Traveler.
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How to Obtain
Players can get a character's Stella Fortuna by obtaining a duplicate of the character from Wishes, or by obtaining the character through other means, such as buying the character from the Paimon's Bargains shop or through certain Events, both of which require having acquired at least one copy of that character prior as well to get the Stella Fortuna.
In Aloy's case, the Stella Fortuna exists in her Constellations menu, though acquiring it is not possible currently.
Usage
Since a character has 6 constellations, Stella Fortuna can only be acquired a total of 6 times per character, which means getting the same character 7 times. Getting further duplicates of a character through Wishes will increase the Masterless Starglitter obtained from 2 to 5 for 4 star characters and 10 to 25 for 5 star characters.
Each character has their own version of Stella Fortuna, and despite sharing the same icon, Stella Fortunas of the same rarity cannot be used interchangeably (e.g. Diluc's Stella Fortuna cannot be used to unlock a Klee constellation and vice-versa) nor is there a version of Stella Fortuna that can be used on any character.
The Traveler's equivalent to Stella Fortuna is the Memory of Roving Gales, Memory of Immovable Crystals and the Memory of Violet Flash for their Anemo, Geo and Electro constellations respectively.
