u/99-Coins
Hey there guys, so I'll get straight to the point. Sandrone's kit was leaked and the details were deemed credible from several trusted sources. What we learned is that Stellar Reactions are confirmed.
Anyway, the main difference between Lunar and Stellar (at the moment) is that Lunar Reactions are a group project and Stellar Reactions are akin to Nightsoul. Lunar Reactions took any source of eligible damage, from any character, and turned it into lunar damage. In contrast, Stellar Reactions can only be triggered by Stellar characters (just like how Natlanese can only trigger Nightsoul)
Since Traveler gained the ability to use Nightsoul in Natlan (and Pneuma/Ouisa in Fontaine) there's a decent chance that Cryo MC will have the ability to use the regional gimmick of Snezhnaya.
Now what does this mean from a gameplay perspective?
Assuming that CMC gets Stellar Cryo infusion, and artifact/character trends continue as they've done in Nodkrai, this might be the strongest version of Traveler.
The reasoning is because Hoyoverse made a strong commitment to factions, specialization, and faction synergy. Natlan was the beginning, but they went all in with Lunar and Hexerei. If Traveler is a Stellar character, they'll be able to load up on Stellar Reaction DMG Buffs from other Snezhnayan characters, and these will probably be far stronger than traditional Elemental DMG buffs.
In addition, I'm sure the Stellar Reaction artifact sets will be very potent just like Obsidian/Cinder City/Hex and etcetera
BUT AGAIN, nothing about Traveler is confirmed. This is all speculation based off the past 6 years of Traveler trends and the recent information from leaks. Aside from Nod Krai, Traveler typically gets to directly participate in the regional gimmick, and the regional gimmick of Snezhnaya seems to be Stellar Reactions.