turning into a black hole of dullness 
(ROOT (S (VP (VBG turning) (PP (IN into) (NP (NP (DT a) (JJ black) (NN hole)) (PP (IN of) (NP (NN dullness))))))))
(ROOT (S (VP (VBG ) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN ))))))))