Storm Cleric Sorcerer BG3 Multiclass Made Easy (Simple Steps to Create This Powerful Combo)

This multiclass combines the Tempest Domain Cleric's divine power over storms with the innate arcane might of the Storm Sorcery Sorcerer, creating a potent spellcaster specializing in maximized lightning and thunder damage, alongside strong battlefield control and survivability.

Core Components & Synergies

The primary synergy revolves around the Tempest Cleric's Channel Divinity: Destructive Wrath, which allows the character to deal maximum damage with a lightning or thunder spell. This is paired with the Storm Sorcerer's access to powerful lightning/thunder spells and their Tempestuous Magic feature, granting flight as a bonus action after casting a leveled spell.

• Tempest Domain Cleric (typically 2 levels):
  • Proficiency in Heavy Armor and Martial Weapons.
  • Wrath of the Storm: Reaction damage when hit.
  • Channel Divinity: Destructive Wrath: Maximize lightning or thunder damage (1 use per Short Rest at Cleric 2).
• Storm Sorcery Sorcerer (typically 10 levels):
  • Tempestuous Magic: Fly as a bonus action after casting a 1st-level spell or higher, without provoking opportunity attacks.
  • Heart of the Storm: Deal bonus lightning/thunder damage to nearby enemies when casting a 1st-level or higher lightning/thunder spell.
  • Sorcerer Spell List: Access to key offensive spells.
  • Metamagic: Enhance spells with options like Quickened Spell, Twinned Spell, Heightened Spell.
  • More spell slots than a full Cleric for primary casting.

Recommended Level Progression

The most common and effective split is Tempest Cleric 2 / Storm Sorcerer 10.

• Start Sorcerer 1 for Constitution saving throw proficiency.
• Take Cleric 1-2 for heavy armor and Destructive Wrath.
• Continue with Sorcerer levels for spell progression, Metamagic, and higher-level spells.

An alternative approach is Tempest Cleric 6 / Storm Sorcerer 6. This provides a second use of Channel Divinity, more Cleric spells like Spirit Guardians, and Thunderbolt Strike (pushback on lightning damage), but delays high-level Sorcerer spells and features.

Stat Priorities

Prioritize your ability scores as follows:

1. Charisma: This is the primary spellcasting ability for Sorcerer spells, affecting spell save DC and spell attack rolls.
2. Constitution: Increases maximum hit points and improves concentration saving throws for maintaining spells.
3. Wisdom: A minimum of 13 is required for multiclassing into or out of Cleric. It also affects Cleric spell preparation and their save DC, though this is less critical with only a 2-level Cleric dip.
4. Dexterity: Can be lower due to heavy armor proficiency. It still contributes to initiative.
5. Strength: Can be a lower priority if using heavy armor that does not impose a Strength requirement or if the requirement is met. Some heavy armors reduce movement speed if Strength is too low.
6. Intelligence: Typically the lowest priority stat for this build.

Key Feats

Consider these feats to enhance the build's capabilities:

• Ability Score Improvement: Increasing Charisma by +2 is often the top priority to boost spellcasting effectiveness.
• Elemental Adept (Lightning): This feat allows your lightning spells to ignore resistance to lightning damage. Additionally, when you roll damage for a lightning spell, any 1 on a damage die is treated as a 2.
• War Caster: Grants advantage on Constitution saving throws to maintain concentration on spells. It also allows you to cast certain spells as an opportunity attack.
• Alert: Provides a +5 bonus to initiative and prevents you from being surprised, allowing for earlier battlefield control.

Core Spells & Abilities

Focus on spells and abilities that synergize with lightning/thunder damage and control:

• Essential Setup:
  • Create or Destroy Water (Cleric spell, or Sorcerer via other means): Applying the Wet condition to enemies doubles the lightning damage they take. This is a crucial preparatory step.
• Key Damage Spells (Primarily Sorcerer):
  • Chromatic Orb (Lightning or Thunder): Versatile early-game single-target damage.
  • Witch Bolt: Single-target sustained lightning damage, effective early on and can be upcast.
  • Shatter (Thunder): Area of effect thunder damage.
  • Lightning Bolt: Powerful line area of effect lightning damage.
  • Call Lightning (Available to Tempest Cleric at level 5, or Sorcerer via items/scrolls): Sustained area of effect lightning damage over multiple turns.
  • Chain Lightning: High-level spell that hits multiple targets with lightning damage.
• Metamagic Options (Sorcerer):
  • Quickened Spell: Allows casting a spell as a bonus action. This can be used for two spells in one turn or a spell combined with strategic repositioning using Tempestuous Magic.
  • Twinned Spell: Makes a single-target spell target a second creature (e.g., Twinned Haste, Twinned Chromatic Orb).
  • Heightened Spell: Imposes disadvantage on the first saving throw targets make against the spell.
• Utility and Support Spells:
  • Healing Word (Cleric): Bonus action healing.
  • Shield (Sorcerer): Reaction to increase Armor Class.
  • Misty Step (Sorcerer) / Tempestuous Magic (Storm Sorcerer): Excellent mobility options.
  • Counterspell (Sorcerer): Crucial for disrupting enemy spellcasters.
  • Haste (Sorcerer): Powerful buff, can be twinned for two allies.

Gameplay Strategy

The typical combat flow for this build involves:

1. Preparation: If possible, apply the Wet status to priority targets using the Create Water spell, throwing a water bottle, or utilizing environmental water sources.
2. Execution: Cast a high-impact Lightning or Thunder damage spell targeting the Wet enemies or a vulnerable group.
3. Maximization: Use a reaction to activate Channel Divinity: Destructive Wrath when the damage roll for the chosen spell occurs. This will ensure the spell deals its maximum possible lightning or thunder damage.
4. Follow-up & Control: Utilize Metamagic options. For instance, use Quickened Spell to cast another spell (damage or utility) or an attack cantrip as a bonus action.
5. Repositioning: After casting a leveled spell, use the Storm Sorcerer's Tempestuous Magic feature to fly to a more advantageous or safer position as a bonus action, without provoking opportunity attacks.

This build offers significant burst damage potential, especially when exploiting the Wet condition with maximized lightning spells. The inclusion of heavy armor proficiency from the Cleric levels provides substantial survivability, allowing the caster to operate effectively even in challenging encounters.