Utsubobo Seamount is the fourth stage in Primeval Currents.
- Kory and B.B.Bunny are sent out 6.6 seconds into the battle.
- B.B.Bunnies spawn at a mild rate of one every 3.3~10 seconds.
- Oldhorn will join in after 26.6 seconds.
- Another Kory spawns after 80 seconds.
- Another Oldhorn spawns after 106.6 seconds.
- The last threatening enemy in the stage, Berserkory, will appear after 146.6 seconds.
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