# their own position of authority
"the responsibilities God entrusted to them"
# their proper dwelling place
The proper dwelling place of angels is heaven.
# God has kept them in everlasting chains, in utter darkness
"God has put these angels in a dark prison from which they will never escape"
# utter darkness
Here "darkness" is a metonym which represents the place of the dead or hell. Alternate translation: "in utter darkness in hell" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# the great day
the final day when God will judge everyone