γουνοῦμαι σε ἄνασσα· θεὸς νύ τις ἦ βροτός ἐσσι·
(Odyssey 6. 149)
I don't understand the which is the function of νῦν here. I have already read the whole entry of perseus for νῦν, but it didn't help. I only found the following uses of νῦν, that perhaps apply to my case, although I don't see how yet:
2. [select] in Ep. mostly as a particle of emphasis, “ἧκε δ᾽ ἐπ᾽ Ἀργείοισι κακὸν βέλος: οἱ δέ νυ λαοὶ θνῇσκον” Il.1.382, etc. : freq. coupled with other Particles or Conjs., “ἦ ῥά ν.” 4.93 ; “καί νύ κεν” 3.373 ; οὔ ν., μή νύ τοι, 10.165, 1.28 ; ἐπεί νύ τοι ib.416 ; “ὥς νύ περ” 2.258.
4. [select] in questions, τίς ν. ; τί ν. ; who, what, why now? Il.5.373, 1.414,4.31 ; ἦ νυ . . ; Od.6.125. [In signf. I always perispom. In signf. II perispom. exc. when short, Hdn.Gr.2.39, al. ; enclit. when short, sts. in codd., as Il.23.485 (Pap. in AJP21.304, etc. ; oxyt. when = δή, Tyrannioap.Hdn.Gr.2.27 ; καθ᾽ ὁμαλισμόν or κατ᾽ ἔγκλισιν when=δή, Sch.Ar.Pl.414, Sch. A.R. 1.664). In codd. usu. perispom. in both senses, A.Pr.82, Th.242, 246, S.Ant.705,El.324, Ar.Pl.414, V.758,922, etc. ; even νυ^ν is written νῦν in codd. vett. Pi. passim, also in S.Aj.87, Tr.92, etc. ; hence νυν may freq. be restored where the sense requires it. The accent of τοίνυ_^ν perh. shows that both νυ^ν and νυ_ν could be enclitic.—Position : in signf. I νῦν can occupy any position ; in signf. II it prefers (like other enclitics, but also like ἄν, δέ, γάρ, etc.) the second place in the sentence, e.g. “πρός νύν σε πατρός” S.Ph.468, cf. OC1333 ; “ἀπό νύν με λείπετ᾽ ἤδη” Id.Ph.1177 (lyr.) ; “μετά νυν δός” E.Supp.56 (lyr.) ; νυ (always enclitic) precedes other enclitics and allows only δέ to precede.] (Cf. Skt. nú, n[umacracute], nūnám, OE. nū 'now', etc.)