Moonstruck Phantasm

The Moonstruck Apparition fights in a forcefield arena and uses a set of attacks with telegraphs. It lunges at a target three times in succession, summons four energy spheres and then launches one at the target, and warps to positions above the target to throw beams in a plus shape and a cross shape. Two telegraphed lines cross over the target's position before erupting. The boss can also cast an incantation that restores nearly a fifth of its maximum health, and a player who interrupts the spell can deal damage to it, even a minimal amount.

The fight is designed around dodging. Some attacks give subtle hints before they are used, and the boss is programmed with that in mind. Players who expect the pattern can react and counter attacks, though a few trial runs are advisable before a first confrontation. The boss also unleashes linear storm projectiles that can combine into hard-to-escape sequences. In the current release the boss cannot be reached in survival mode and is only accessible through creative mode or commands, and a future update is planned to add a reward drop for defeating it.

The mod requires Geckolib. It is a server-required, client-optional mod, so the server must run it while players may choose to install it. Files are published for Fabric, Forge, NeoForge and Quilt, all for 1.20.1, and the code is released under the MIT License, though the project is not open source.