Synthfish

Description
The synthfish are magic based constructs made of copper, stone, and amethyst crystal cores, that look and for the most part act like fish.

Groups of synthfish can appear in any large body of water, and exhibit many behaviors of a fish variety, though if one is attacked, the rest will flee and perhaps eventually despawn, it is also possible to rarely fish them with a fishing rod.

Six hearts of health, if killed, they drop themselves and can be smelted into copper ingots, on rare occasion they can also drop a 'crystal core' item.

There also exists a rare variant of the synthfish, simply named: the gunfish, as oppose to the rest of them, the gunfish will actually fight back if it or any other synthfish is attacked, it can shoot short beams of light which do 4 hearts of damage and a lot of knockback, if killed, the gunfish will always drop itself, and can be used as an item weapon that does the same attack as the mob version, although doing 3 hearts instead and with a bit less knockback, it consumes exp for ammo.

Visual
"Visually made of copper, stone, and glowing amethyst, which proves to be the most visible attribute about them. These aquatic... forms appear to be some form of artificial construct, animated by a remarkably complex set of spells that seem to be stored in the lattices of the crystal. Found usually in groups, with rare instances found alone, they come and go in the waters, arriving from seemingly nowhere and eventually leaving the same way."

- Anonymous Alteniquian Researcher

Behavier
"At first glance, their behavior isn't unlike your typical wild fish: travelling among the waters, avoiding of larger fish and strangely they even seem to eat things occasionally as well. But, look deeper and you'll find them always using patterns, a group of them arrives, they circle in the same patterns at least 3 maybe even 5 times; Sometimes they spread out, sometimes they are drawn to seemingly random areas and simply do nothing for hours, and their arrivial and leaving almost seems like they are purposefully concealing their trace, and most peculiar, they always seem to know where each other are, there are times when the entire group is separated and all at once they circle in to a specific point and join back up, and if one is caught, the rest will immediately act in some new way, usually fleeing."

- Alek, Frosmarchian Fishmaster