Rat King Subclass for Warlock

Adds the Rat King subclass for Warlock. Includes new Spells, Eldritch Invocations, and Passives.

The Rat King subclass specialises in dealing Poison damage and fighting alongside its Pact Rat companion.

I would recommend choosing Pact of the Blade with this subclass. The summons from Pact of the Chain overwrite the Pact Rat, so it doesn't synergise very well with that.

Rat King Levels:

Level 1:

Summon Pact Rat - Summons a Pact Rat companion.

Pact Tactics - When you are near your Pact Rat, you attack with Advantage.

Expanded Level 1 Spell List - Ray of Sickness, Venomous Bite.

Level 3:

Expanded Level 2 Spell List - Melf's Acid Arrow, Pass Without Trace.

Level 5:

Upgraded Pact Rat - You can now summon a Plague Pact Rat.

Expanded Level 3 Spell List - Stinking Cloud, Carrion Curse.

Level 6:

Plague Carrier - Whenever you deal Poison damage, the target must succeed a Con Save or become Poisoned.

Level 7:

Expanded Level 4 Spell List - Evard's Black Tentacles, Confusion.

Level 9:

Expanded Level 5 Spell List - Cloud Kill, Black Death.

Level 10:

Upgraded Pact Rat - You can now summon an Awakened Pact Rat.

Swarm Leader - When an enemy within range attacks a Pact Rat, you can use a reaction to retaliate.

Summon Pact Rat - Summons a Pact Rat companion. (Upgrades at level 5 and 10)

Venomous Bite - 3d8 Poison Damage, Melee Spell, possibly Poisons the target.

Carrion Curse - 4d8 Poison Damage, Ranged Spell, curses the target. Cursed targets explode when they die, dealing 2d8 Poison Damage to nearby creatures.

Black Death - 8d8 Poison Damage, Ranged Spell, reduced the targets Max HP by the damage dealt.

Level 2:

Eldritch Infection - You can cast Infected Eldritch Blast, a variant which deals Poison Damage.

Selfish Scurry - You can cast Longstrider on only yourself without using a spell slot.

Vermin Resilience - You gain resistance to Poison Damage, and immunity to Poisoned condition.

Level 5:

Gnashing Teeth - Your Pact Rat gains an extra attack.

Level 9:

Plague of Flies - You can cast Insect Plague with a Warlock Spell Slot.

Outbreak - You can cast Contagion with a Warlock Spell slot.

Level 12:

Plague Bringer - Attacks made with your Pact Weapon deals bonus Poison Damage equal to your Charisma Modifier.