Potion Core

Attack:

Trueshot - Increases projectile damage (like how strength increases melee damage).

Klutz - Decreases projectile damage (like how weakness decreases melee damage).

Magic Focus - Increases magic damage (like how strength increases melee damage).

Magic Inhibition - Decreases magic damage (like how weakness decreases melee damage).

Recoil - Reflects a portion of damage back to the attacker.

Burst - Makes you explode but doesn't hurt you (only your enemies), and doesn't do block damage.

Explosion - Explodes you.

Combustion - Sets you on fire.

Lightning - Strikes you with lightning.

Launch - Shoots you up into the air.

Defense:

Vulnerability - Increases all damage to you (like how resistance decreases all damage to you).

Broken Armor - Decreases your armor

Iron Skin - Increases your armor

Diamond Skin - Increases your armor toughness

Magic Shielding - Protects you from magic damage (which is normally unblockable)

Solid Core - Gives you knockback resistance.

Revival - If you die with this effect on, you will revive with 2 hearts per level.

Utility:

Slowfall - Slows your fall and prevents some fall damage at level 1, and all fall damage at level 2.

Step Up - Increases your step height so you can step up a full block.

Reach - Increases your reach distance.

Climbing - Lets you climb walls like spiders.

Corrosion - Damages your armor and held item (except for gold items/armor).

Repairing - Repairs your armor and held item.

Flight - Lets you fly like in creative mode.

Random Teleport - Teleports you to a nearby location.

Surface Teleport - Teleports you to the top surface block.

Spawn Teleport - Teleports you to your spawn point if you stand still with it for 10 seconds.

Love - Causes breedable entities to breed with eachother.

Antidote - Prevents you from taking poison damage.

Purity - Prevents you from taking wither damage.

Other:

Drowning - Makes you only breath underwater.

Weight - Negative jump boost; makes it so you can't jump up a full block.

Disorganization - Shuffles your inventory

Perplexity - Reverses your controls so forwards is backwards, sneak is jump, etc.

Extension - Prevents one other potion on you from ticking down per level. Essentially doubles the length of another potion on you.

Chance - Gives you one random potion effect (could be good or bad).

Bless - Gives you one random good potion effect.

Curse - Gives you one random bad potion effect.

Cure - Clears all bad potion effects from you.

Dispel - Clears all good potion effects from you.

Inversion - Inverts all potion effects on you (like regeneration -> wither, strength -> weakness, etc.).

Potion Sickness - Disabled by default. Has a low chance of giving you a random bad potion effect. 

It also changes the way a few vanilla potions work:

Blindness - Now the fog comes closer per level (making you more blind), and it also affects mobs, so they won't attack you unless you are close to them.

Jump Boost - You can control how high you jump by holding down the space bar, so you can jump up one block instead of shooting into the air.

Projectile Damage

• Attribute Name: potioncore.projectileDamage
• Default: 1
• Range: 0 - 2048
• What it does: Represents your projectile damage from bows, thrown items, etc. Used by the archery and klutz potions.

Magic Damage:

• Attribute Name: potioncore.magicDamage
• Default: 1
• Range: 0 - 2048
• What it does: Represents your magic damage, which in vanilla minecraft is only from throwing harming/healing potions. Used by the magic focus and magic inhibition potions.

Jump Height:

• Attribute Name: potioncore.jumpHeight
• Default: 1
• Range: 0 - 2048
• What it does: Represents the height you can jump. Used by the weight and vanilla jump boost potions.

Dig Speed:

• Attribute Name: potioncore.digSpeed
• Default: 1
• Range: 8.1E-4 - 2048
• What it does: Represents your dig speed. Used by the vanilla haste potion (mining fatigue doesn't use it, since it's effects aren't linear).

Reach: Removed in 1.12 onwards! Use forge's generic.reachDistance instead!

• Attribute Name: potioncore.reach
• Default: 4.5
• Range: 0 - 2048
• What it does: Represents your reach in blocks. Used by the reach potion.

Step Height:

• Attribute Name: potioncore.stepHeight
• Default: 0.6
• Range: 0 - 256
• What it does: Represents how high you can step. Used by the step up potion.

Damage Resistance:

• Attribute Name: potioncore.damageResistance
• Default: 1
• Range: -2048 - 2
• What it does: Represents your damage resistance, where 1 is normal, 2 is 100% resistance, and values below 1 decrease your resistance. Used by the vulnerability and vanilla resistance potions.

Magic Shielding:

• Attribute Name: potioncore.magicShielding
• Default: 0
• Range: 0 - 20
• What it does: Represents your magic 'armor', which protects you from magic damage (since magic damage penetrates normal armor). Used by the magic shield potion.

• Going into the Files on curseforge, and clicking on the file name you want to download it for
• Scrolling down to the related files on the bottom.
• Download both the deobf and sources files.
• In your forge dev environment, create a libs folder.
• Drag both files into the libs folder.
• If you are using eclipse, go to the libs folder, right click on the deobf file, and click Build Path -> Add to Build Path
• It should now be loaded at the bottom of Referenced Libraries.
• Try to open a class, click Add Source, and point it to the sources file.
• It should now be loaded as a library.