D&D • Blood Magic

Blood Magic Calculator

Choose spells from your spell list, automatically reconcile combination requirements, calculate the HP sacrifice, and plan where the blood comes from.

Required Sacrifice 0 HP Configure a spell to begin
Spell Slot — Base spell cast level
Cost Rate 10 HP per spell level / mutation
Source Range 60 ft from the caster

01

Caster Profile

02

Base Spell

The highest cast-level spell in the Blood spell. Start typing to select one of the spells loaded from data/spells.csv.

Select a spell from the CSV list to load its rules metadata.

Chosen Mutations

Mutations you want for the spell itself. Compatibility mutations are added automatically below.

No mutations added.

Automatic Compatibility Mutations

Required mutations are included in the HP total automatically.

No compatibility mutations required.

03

Final Target

The Blood Magic rules require the final target to be in range of every component spell. This lets the app determine required Transfer and Distance mutations.

04

Combined Spells

Each combined spell adds its cast level × the HP rate. The app compares casting time, range, and concentration duration and adds required mutations.

No spells combined.

05

Final Concentration

Focused is applied after combination and uses the final Blood spell’s base cast level for its cost.

Focused

Advantage on saves to maintain concentration, or transfer concentration to the target.

06

DM-Approved Custom Costs

For custom mutations where the DM sets a stronger or different sacrifice, enter the HP cost directly.

No custom sacrifice costs.

07

Sacrifice Planner

Allocate the required current HP across valid sources before casting.

No sacrifice sources added.
0 / 0 HP allocated 0 HP remaining