Congrats to @cloverflame0101 For guessing the last cat! It was Mistystar! Here's the next one...

Father a killer,
Mother not clan,
Tried to save brother,
Failed by plan,
Sister he had,
Clan soon they joined,
Soon mother left,
Long time ago father dead,
Traveled with adopted,
Clanmates anew,
To the lake,
Where everything was new,
Gave sis fake prophecys,
Deputy wanted,
Followed the darkness,
Yet still loyal to clan adopted,
Brother vs brother,
Dead by the lake,
Joined in the darkness,
Killer at stake.

who am I?