What is the real name of R.A.B., the Horcrux thief?
Regulus Arcturus Black.
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> What is the real name of R.A.B., the Horcrux thief? [/INST] Regulus Arcturus Black. </s>