Had another idea: a mod based on
The Darkness comics, as well as the games. Basically, you find a book in a dark dungeon buried deep within the earth detailing an ancient ritual to imbue the caster with incredible power. It requires a great many expensive and rare components, and many long nights imbuing yourself with dark essence, but eventually you plant a seed of darkness within yourself, becoming a host of the ultimate force of chaos and creation: The Darkness. While you're in dark areas, or out at night, you become almost unstoppable, so long as you keep your reserves of dark essence replenished. You gain different levels of dark essence depending on the power of the mobs you kill: zombies and skeletons would only be worth a little, but creepers and endermen would be worth a bit more, and things like the Wither would almost completely replenish your power. (Dark essence replenishes naturally, but slowly, in dark areas.) You can also channel your power to summon Darklings: foul-mouthed, little imps that happily rip apart your enemies and perform tasks for you.
It'd also include an eclipse mechanic, similar to Random Things' blood moon: every once in a great while, the moon eclipses the sun, blocking out the light that suppresses your powers. During an eclipse, mobs become stronger, but so do your powers. Darkness hosts are almost literally unstoppable during an eclipse, as your dark energy would refill at a much greater rate than in normal darkness.
Powers would be things like...
- Black Hole: Throw a piece of the Darkness at a given location. This piece of the Darkness draws everything (except other Darkness hosts) toward it for several seconds, causing massive damage to both creatures and terrain, before releasing everything within with a massive explosion.
- Suspension: Throw up tentacles in a large area around you. Any hostile mobs (or players, if the option is turned on) caught by them are suspended in the air and can neither move nor act for a time, giving you plenty of time to kill them.
- Dark Barrier: Erect a temporary barrier of solid Darkness between you and your enemies that they cannot cross. Excellent for emergencies.
- Dark Mark/Dark Recall: Mark locations by dropping small seeds of Darkness into the ground that you can later recall to, granting enhanced mobility. Can even work across dimensions, though at greater cost.
- Grapple: Use a Darkness tentacle to grab on to a far away block, pulling you towards it. Requires line of sight, but otherwise has no limitations.
- Battle Drop: Negates fall damage. Whenever you would take falling damage, you instead send out a shockwave of size and damage proportional to the damage you would've otherwise taken.
- Dark Haste: Using the power of the Darkness, your speed increases by an order of magnitude for as long as you maintain the power, as well as gaining Step Assist. Combine this with Grapple for unparalleled mobility.
- Armour of Darkness: Wrap yourself in dark essence. You become immune to pain, even as you inflict it on others. Any damage you take is instead diverted to your dark essence reserves.