Starlight - Core is a Plugin, that allows you to make something called Quantum Rifts
A Quantum Rift is a Dimension created by doing /starlight quantumrift create Which allows you to make a Quantum Rift. You're able to choose a Preset from a GUI (Azure, Neghentic, Chaos), and are able to name it.
by doing /starlight quantumrift summon you can summon a Quantum Rift
A Quantum Rift has a preset MythicMob in it, which you can configure. All Files will be Pre generated. Once the Mob is Slain, the Quantum Rift Closes.
Be able to create your own Quantum Rifts, not based off of Presets.