This mob adds Invalid Genie, the creature that was summoned to help you speedrun, but every time spoil things. This Genie is invulnerable and will go after you always.

He will make some things, like:

• Replace lava with magma and water with ice
• Add curses to your armor and tools
• Replace food with chorus fruits
• Decrement your health when you eat golden apple
• Decrement your food level
• Teleport all mobs around every 5 minutes

...and much more annoying things!

There's also a Jax mode that adds a skin of Jax from Amazing Digital Circus to Genie.

I am challenging you to beat Minecraft with it!