bloodclan isn't in this game, do you mean the dark forest? you can go to the dead cats profile in starclan and click on the dangerous button on the far right, click "exile to dark forest"
you don't need to do anything special to get them if you have the latest version! you just have to get cats that are either born paralyzed or become paralyzed due to a condition, like a broken back.
the patrol where you find a loner by the thunderpath tends to have cats with a broken bone or back.
