In order to unlock the bijuu cloak you must first have sealed a tailed beast into yourself. After that, you have to wait for about 5-50 hours. When this time has passed you need to DIE.  yes. you NEED to die. Then the bijuu inside you will say something in chat..you do the same thing again for every other stage. Here is what the tailed beast will say in first and 2nd stage.

What the bijuu will say when you unlock stage 1 and stage 2

Bijuu cloak

Bijuu stage 2... dont ask where the face went... got bugged

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