Sins and Blessings is the final stage in Ritual Confusion.
Lucky Sloth spawns immediately as a boss.
Dark Otter joins shortly afterward, and will respawn every 36.7 seconds until 4 of them have been seen.
For every 30 seconds that pass, a Metal Hippoe will spawn, until 3 Metal Hippoes have been seen.
After 75 seconds have passed, 4 additional Lucky Dagses will join the fray, with a quicker 6.7-second delay.
Even though the Lucky Dagses are single-target, they can snipe your attackers effectively whenever Lucky Sloth's knockback proc deactivates the hitboxes of your surviving Erasers. So once no more Metal Hippoes or Dark Otters are around, it is time to pile up your attackers.