This mod is needed for eponymous server. But it still provides cool and interesting mechanics, tools and utilities to the game!
Features
Steel tool&armor material
It's better than iron, but worse than diamond. And yes, to make game more paced diamond recipes (not including chisel and trowel) were removed.
Steel hammer
Overpriced 3x3 pickaxe. It also converts some blocks into their counterparts and crushes ores.
Chisel
It can replace the block that the player is looking at with the one that is to the right of the chisel in hotbar.
Trowel
It places random blocks from player's hotbar.
Contorollable lanterns
Lanterns that can be disabled using redstone or your hand! Just be careful - don't spam it.
Redstone lantern
Idk where I was going with this but it's cool I guess.
Very configurable in-game flashlight
There are even lenses to put into it. (This uses Veil)
Sitting and crawling
Can be done using commands (/sit and /crawl) or keybinds.
Some cool hats
A bunch of them are even useful
World-wide event commands
Do sky flashes, star changes, shakes and even more. Really useful if you're trying to write a story.