Sacred Lovestorm Turtle

Three turtles share the Valentides 2 event: the Lovestorm Turtle, the Supercharged Lovestorm Turtle and this one, the Sacred Lovestorm Turtle, which only appears while the Sacred Lovestorm event is running. Its conditions are Clear weather and Winter, and the wiki calls it a challenging fish to reel in: hooking it applies a -97% progress speed penalty by default, and it moves unpredictably depending on the rod.

The wiki recommends rods with high control and resilience, such as the Fabulous Rod or other late-game rods. For bait, Limited Fischversation Hearts give the Candy mutation (2x) and Limited Chocolate Fish give the Chocolate mutation (2.5x).

One oddity from the wiki: you can catch it unlimited times until the Sacred Lovestorm goes away. In a few servers the event never despawned, which stopped the other Lovestorm Turtles from spawning, yet players could keep catching the Sacred one indefinitely. Its quips are “BEAUTIFUL LOVE!” and “SACRED LOVE!”