"Turns out it's just regular electricity, not magical electricity."
This crimson jellyfish looked a lot like the ones that spawned in the puddles within the Crimson Biome in Terraria that Lu Yun and the others played.
However, the jellyfish in the game released "magical" electricity; no matter how far away you were, as long as you touched the water, you'd get shocked—completely unreasonable.
Chapter 453