Ovid speaks of the daring love requires.
Per Styga detur, Stygias transabimus undas; sunt mihi naturae iura novanda meae.
If passage be granted through the Styx, we will cross over Stygian waves; the laws of my nature must be changed
Per: through
Styga: Styx (accusative singular)
Detur: if it be granted
Stygias: Stygian (plural adjective)
Undas: waves
Transabimus: we will cross over
Sunt mihi: I have
Naturae meae: of my nature
Iura: laws
Novanda: must be changed