Roar, Eclipse, Vex Armor, Amp and Xata's Whisper are all mutually exclusive abilities. You can't have more than one of them on a frame.
I don't know if they stack while in a party and cast by different players.
i think eclipse and roar can stack cus i often subsume eclipse on my frames, and the roar buff from squadmates still appear on the top right UI.
i also know multiple roars can stack cus ive had multiple occasions where two squadmates have roar and both their roars also appear on the top right UI.
Roars do not stack, only the strongest takes effect
And roar and eclipse do stack together, they both are separate multipliers
You cannot put another damage buff ability onto a frame that has a damage buff, unless you replace the ability. So you cannot put eclipse on rhino unless you replace roar. You can however replace one of rhino's ability with Oberon's Smite/Ember's Fireball/Volt's Shock and use their augment to make it into a damage buff, as that's allowed.
If you get eclipse/roar from another warframe, while you have the other. They do both work.
My understanding is that certain frame abilities, such as Roar, Eclipse and Xata's Whisper are tagged as "damage boosting" abilities, and can only be subsumed onto other damage boosting abilities, specifically to prevent that interaction.
source info can be found at this section of the wiki: https://warframe.fandom.com/wiki/Helminth#Injecting_and_Replacing_Abilities
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