Yes, Night will devour Day, but Macbeth's significant meaning here  under cover of darkness'in reckless defiance of weird authority'he will have his black agents eliminate the bonded progenitor of Scottish kings, along with his only progeny.
( ( Yes ( , ( ( ( ( Night ( will ( devour Day ) ) ) , ) but ) ( Macbeth ( ( 's significant ) ( ( meaning here ) ( under ( cover ( of ( ( ( darkness ` ) ( in ( ( reckless defiance ) ( of ( weird authority ) ) ) ) ) ` ) ) ) ) ) ) ) ) ) ) ( he ( ( will ( have ( ( his ( black agents ) ) ( eliminate ( ( ( ( the ( bonded progenitor ) ) ( of ( Scottish kings ) ) ) , ) ( along ( with ( his ( only progeny ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (S (INTJ (UH Yes)) (, ,) (S (NP (NNP Night)) (VP (MD will) (VP (VB devour) (NP (NN Day))))) (, ,) (CC but) (S (NP (NNP Macbeth)) (VP (VBZ 's) (ADJP (JJ significant)) (S (VP (VBG meaning) (ADVP (RB here)) (PP (IN under) (NP (NP (NN cover)) (PP (IN of) (NP (NP (NNS darkness)) (`` `) (PP (IN in) (NP (NP (JJ reckless) (NN defiance)) (PP (IN of) (NP (JJ weird) (NN authority))))) (`` `)))))))))) (NP (PRP he)) (VP (MD will) (VP (VB have) (S (NP (PRP$ his) (JJ black) (NNS agents)) (VP (VB eliminate) (NP (NP (DT the) (VBN bonded) (NN progenitor)) (PP (IN of) (NP (JJ Scottish) (NNS kings))) (, ,) (ADVP (IN along) (PP (IN with) (NP (PRP$ his) (JJ only) (NN progeny))))))))) (. .)))
The black agents are evildoers who kill the progenitors and progeny.
( ( The ( black agents ) ) ( ( are ( evildoers ( who ( kill ( ( ( the progenitors ) and ) progeny ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ black) (NNS agents)) (VP (VBP are) (NP (NP (NNS evildoers)) (SBAR (WHNP (WP who)) (S (VP (VBP kill) (NP (NP (DT the) (NNS progenitors)) (CC and) (NP (NN progeny)))))))) (. .)))