You are free to download, but the description will be quite lacking.
Adds a new Underlight dimension, accessed from the Ancient City portal. Mine Zircon to unlock new recipes for new items and blocks.
Adds ideas such as: wireless redstone, tradeable xp, more totems, headlamps, a little friend.
There is a better description in the Mcreator page. It's outdated, but better https://mcreator.net/modification/115270/lightning
