Is there a reason i havent seen the boss thats not on the island? Ive fought the reaper 5times in a row and no boss :(

That's just how it goes sometimes, since it's random whether or not it's a placeholder or a named. You tend to see the placeholders more often than the named as well. Sometimes you'll just see the place holder over and over and over again sometimes you'll get the named several times in a row. It's all random chance.

I saw the boss down past the first white werewolf were the ripper is in between a fire and a creped (I don't know if I spelled that right but the thing were the dead sleep )