Here's a list of useful IDs and whatnot for various objects in AbyssalCraft that can be handy to have around when configuring a modpack (or something along the lines of that). This information is applicable for Minecraft versions 1.10.2 through 1.12.2.

Biomes

Name	ID
Darklands	abyssalcraft:darklands
Darklands Forest	abyssalcraft:darklands_forest
Darklands Plains	abyssalcraft:darklands_plains
Darklands Highland	abyssalcraft:darklands_hills
Darklands Mountains	abyssalcraft:darklands_mountains
Coralium Infested Swamp	abyssalcraft:coralium_infested_swamp
Abyssal Wastelands	abyssalcraft:abyssal_wastelands
Dreadlands	abyssalcraft:dreadlands
Purified Dreadlands	abyssalcraft:purified_dreadlands
Dreadlands Forest	abyssalcraft:dreadlands_forest
Dreadlands Mountains	abyssalcraft:dreadlands_mountains
Omothol	abyssalcraft:omothol
Dark Realm	abyssalcraft:dark_realm
Purged	abyssalcraft:purged

Enchantments

Name	ID	Description
Coralium	abyssalcraft:coralium	Inflicts the Coralium Plague on hit
Dread	abyssalcraft:dread	Inflicts the Dread Plague on hit
Light Pierce	abyssalcraft:light_pierce	Increases damage against Shadow mobs
Iron Wall	abyssalcraft:iron_wall	Reduces the amount of knockback applied when hit by an attack
Sapping	abyssalcraft:sapping	Increases the amount of energy a Staff of Rending can drain
Multi-rend	abyssalcraft:multi_rend	Drains energy from mobs surrounding the target

Potions

Name	ID
Coralium Plague	abyssalcraft:cplague
Dread Plague	abyssalcraft:dplague
Antimatter	abyssalcraft:antimatter

Dimensions

Name	ID
The Abyssal Wasteland	50
The Dreadlands	51
Omothol	52
The Dark Realm	53

Entities

Name	ID
Depths Ghoul	abyssalcraft:depthsghoul
Pig	abyssalcraft:evilpig
Abyssal Zombie	abyssalcraft:abyssalzombie
J'zahar, Gatekeeper of The Abyss	abyssalcraft:jzahar
Abyssalnite Golem	abyssalcraft:abygolem
Dreaded Abyssalnite Golem	abyssalcraft:dreadgolem
Dreadguard	abyssalcraft:dreadguard
Spectral Dragon	abyssalcraft:dragonminion
Asorah, The Fallen	abyssalcraft:dragonboss
Shadow Creature	abyssalcraft:shadowcreature
Shadow Monster	abyssalcraft:shadowmonster
Dreadling	abyssalcraft:dreadling
Dread Spawn	abyssalcraft:dreadspawn
Demon Pig	abyssalcraft:demonpig
Skeleton Goliath	abyssalcraft:gskeleton
Spawn of Cha'garoth	abyssalcraft:chagarothspawn
Fist of Cha'garoth	abyssalcraft:chagarothfist
Cha'garoth, The Dreadbeast	abyssalcraft:chagaroth
Shadow Beast	abyssalcraft:shadowbeast
Sacthoth, Harbinger of Doom	abyssalcraft:shadowboss
Abyssal Anti-Zombie	abyssalcraft:antiabyssalzombie
Anti-Bat	abyssalcraft:antibat
Anti-Chicken	abyssalcraft:antichicken
Anti-Cow	abyssalcraft:anticow
Anti-Creeper	abyssalcraft:anticreeper
Anti-Ghoul	abyssalcraft:antighoul
Anti-Pig	abyssalcraft:antipig
Anti-Player	abyssalcraft:antiplayer
Anti-Skeleton	abyssalcraft:antiskeleton
Anti-Spider	abyssalcraft:antispider
Anti-Zombie	abyssalcraft:antizombie
Remnant	abyssalcraft:remnant
Omothol Ghoul	abyssalcraft:omotholghoul
Minion of The Gatekeeper	abyssalcraft:jzaharminion
Greater Dread Spawn	abyssalcraft:greaterdreadspawn
Lesser Dreadbeast	abyssalcraft:lesserdreadbeast
Lesser Shoggoth	abyssalcraft:lessershoggoth
Cow	abyssalcraft:evilcow
Chicken	abyssalcraft:evilchcicken
Demon Cow	abyssalcraft:demoncow
Demon Chicken	abyssalcraft:demonchicken
Sheep	abyssalcraft:evilsheep
Demon Sheep	abyssalcraft:demonsheep
Coralium Infested Squid	abyssalcraft:coraliumsquid
Dark Offspring	abyssalcraft:shuboffspring

Rituals

You can get various information about rituals through the /acritual command.