This is a creature from the Astraeos Mythological Creatures mod

Level 268

Gliding through shallow kelp forests and sparkling coral reefs, the Seahorse (Hippocampus mythica) presents a surreal sight: the front half resembles a graceful horse, while the rear tapers into a powerful finned tail, shimmering with bioluminescent patterns. Despite its delicate appearance, the Seahorse is no stranger to evasive maneuvers. When startled, it releases a harmless cloud of iridescent mist and vanishes into underwater foliage. Though non-aggressive, these creatures remain elusive and are rarely encountered near populated shores.

Low-tier = 2

The item quality value used is intended to target Ramshackle/Apprentice-tier results based on the thresholds shown above. However, actual item quality is still subject to the game's inherent random variation and may occasionally fall outside the expected tier. Results that do not follow the expected progression will not be eligible for dispute or replacement

Mid-tier = 6

The item quality value used is intended to target Journeyman/Mastercraft-tier results based on the thresholds shown above. However, actual item quality is still subject to the game's inherent random variation and may occasionally fall outside the expected tier. Results that do not follow the expected progression will not be eligible for dispute or replacement

High-tier = 10

The item quality value used is intended to target Ascendant-tier results based on the thresholds shown above. However, actual item quality is still subject to the game's inherent random variation and may occasionally fall outside the expected tier. Results that do not follow the expected progression will not be eligible for dispute or replacement