how did Leenile, Pierce and Eagle end up in the dark forest if they all came from starclan? were they ecxiled together?
Nope!
I'd say it's likely that Piercetree went first, then Eagle, then Leenile (though Leenile could easily come before Eagle just as well).
Leenile, Piercetree, Eaglebloom, and Grousemane lived during Alderstar's and Myrtlewing's reign (they were serial killers and hid many bodies). Because of them, many cats from the Clans went missing, and these four were chosen to go find them (Grouse from ShadowClan, Leenile [Creekfire] from WindClan, Eagle from ThunderClan, and Piercetree from SkyClan).
Piercetree:
On the journey, Grousemane and Leenile died by accidents. But Piercetree's leader found it suspicious that no one went missing while they were gone, but two cats happened to die while out with Piercetree. He was a very strong cat, huge and muscular, and he could easily have killed many. So, he was executed just to be safe.
In StarClan, he was furious, and when he confronted his leader (when that leader came to StarClan), he didn't even receive a sincere apology, just a 'whoops my bad' kinda thing and excuses. In a fit of rage, he attacked and killed him, and was chased into the Dark Forest.
Leenile:
Leenile was very upset at all the innocent cats suffering in the Dark Forest, including kits.
He would loudly argue against it and get cats on his side. He was told multiple times to stop and never listened, and some other cats tried to physically fight him. He got the blame, word spreading that he was becoming 'violent' and he was exiled (yes it's bullshit).
Eaglebloom:
Similar to Leenile, Eaglebloom was upset at the injustice. He would take prey and herbs and sneak them over to the Dark Forest. He got caught and was told to stop, but like Leenile, he didn't listen and kept doing it.
He was exiled for 'aiding dangerous cats.'
(It's possible this began after hearing Leenile's speeches).
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Now, they travel together in search of anyone who needs their help!
