I'm counting all groups of cats with "Clan" at the end of their name
I am also counting the tribes and the spirit cats
I've read all the books except for the super editions (I've read a few of the super editions)
The tenth strongest clan/tribe is: WarriorClan, I haven't read Graystripe's Vow, so I can't really rank them (I have the book, but I just don't like it that much, I'll read it sooner or later)
The ninth strongest clan/tribe is: The Dark Forest, they lost some strong cats in Omen of The Stars, and like StarClan, they can only give advice to cats like Breezepelt, or just bad cats in general.
The eighth strongest clan/tribe is: StarClan, they have no power over what cats choose, they can give advice, but in the end, the living cats make the choices
The seventh strongest clan/tribe is: ThunderClan, in the most recent WarriorCats book, Squirrelflight is kidnapped by Ashfur, who has taken over the body of Bramblestar, so now the deputy and leader are gone. Making ThunderClan a weak clan, they're not as strong as they were in Firestar's era, a time when I would consider them the strongest clan
The sixth strongest clan/tribe is: Skyclan, I have literally no explanation whatsoever
The fifth strongest clan/tribe is: RiverClan, I have literally no explanation whatsoever
The fourth strongest clan/tribe is: I worked so hard trying to figure out if WindClan or RiverClan was stronger, but in the end WindClan beat RiverClan, Harestar can be selfish, but that means he cares about his clan more than any other clan,
The third strongest clan/tribe The Tribe of Rushing Water , they are a strong group, able to live with a small amount of food for a while, the original clan cats came from the Tribe of Rushing Water
The second strongest clan/tribe is: For this one, I was going to say ThunderClan, but I realized, that since Bramblestar and Squirrelflight are gone, they are a weak clan currently. So the number two is ShadowClan! They were already stronger than ThunderClan in the first series, but then Mr. Rustystar (Firestar) came along and ruined everything for their plan of world domination. In the Broken Code, we see Tigerstar the Second (Tigerheart) is letting all the exiles into his clan, showing he is not afraid of them attacking him, he will instantly murder them, he even let Ashfur, who is able to take over bodies, inside his camp (as a prisoner)
The strongest clan/tribe is: BloodClan, I know this sounds wrong, they lost a war.
I am talking about the group they had when Scourge was leader.
The only reason they lost the war is because Firestar had 9 lives!
Okay fine, they also lost because four whole clans were fighting against them.
And a former BloodClan cat, Barley, fought against them.
And their leader was the size of an apprentice.