What domain should I Get. Malevolent shrine, unlimited void, celestial opera or unequivocal love?

Shrine for pve, void for PvP and celestial opera for both or if you use mostly star rage moves (4/8 or higher)

Shrine is best overall imo

Nah, i have both shrine and opera. if u have fuga flame chant, just take shrine without a second thought. but if u wanna do burst damage, then take celestial opera, each move, without buffs or chant does minimum 3k damage, use buffs and chants and it scales upto 12k damage, especially terra and jupiter does like 8-10k at maximum. Unequivocal love is a gamble, since u get a random moveset, but the domains appearance is very good, as for void, it is ur gamestyle, if u play pvp mostly, take void.

TLDR,

Take shrine if u have fuga chant, take opera if u want best of both, or take void for pvp and unequivocal love if u wanna play with random movesets.

For your first domain, i recommend take opera.