IMPORTANT!!! IF YOU WANT THE WARDEN, GO TO THE WILD MOD! ACCURATE SCULK IS NOW PART OF THAT MOD, AND INCLUDES THE WARDEN!

Sculk Catalyst

Detects mob deaths within an 8-block radius, and will spread Sculk (including Sensors and Shriekers,) the amount of which depends on how much XP that mob would've dropped. CAN BE FOUND IN DUNGEON/MINESHAFT/STRONGHOLD CHESTS.

Sculk Shrieker

Detects Sculk Sensors within an 8-block radius and entities stepping on itself. It will give all players within an 8-block radius Darkness upon being activated.

Sculk

Drops one XP orb upon breaking.

Sculk Veins

Is placed on the borders of Sculk growths, and above blocks that sculk growths are unable to replace.

MULTITHREADING (1.0.7+):
By default, the gamerule sculkThreading is set to true. This saves a TON on performance and is perfect for servers and mostly all hardware.
You can always run "/gamerule sculkThreading false" to disable sculk multithreading, however, beware of low performance with Catalysts.
/gamerule sculkThreads (1.0.9+): Allows you to adjust the available threads for Sculk Growths. If set to 21, every single Sculk Block that gets placed will use a separate thread, its impact on performance may vary based on your hardware.

IF YOU HAVE NOT UPDATED TO 1.0.11 YET, I HIGHLY RECOMMEND YOU DO. IT FIXES MANY CRITICAL LAG ISSUES, AND WILL RUN MUCH FASTER ON ALL HARDWARE.

IF THIS IS USED IN A VIDEO, CREDIT THIS MOD AND LEAVE A LINK TO IT IN THE DESCRIPTION.

Gamerules

spreadMultiplier: Use /gamerule spreadMultipler (1-20) to increase the spread of Sculk Growths, and Sensors/Shriekers!

upwardSpread/downwardSpread: Controls how far updwards and downwards Sculk Growths can spread.

shriekerNeedsSculk: If on, Shriekers will need a Sculk Block underneath them to inflict Darkness on players.

shriekerShrieks: If off, Shriekers will no longer make a sound when activated.

doDarkness: Whether or not players can be inflicted with darkness.

shriekerGargles: If on, Shriekers will make a gargling sound and particles while waterlogged.

catalystPollution: If off, Catalysts won't spread Sculk and will instead spawn XP orbs above themselves. Sculk Sensors and Shriekers will NOT grow on Sculk Blocks, though.

catalystVibrations: If on, Catalysts will show vibrations sent to them like Sculk Sensors and Shriekers.

catalystDetectsAll: Allows Catalysts to detect all game events and spread sculk at their location like walking, jumping, etc., unless the entity is sneaking.

Accurate Sculk