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encounter-balance

verified

This skill should be used when the user asks to "check encounter balance", "review CR", "is this too hard", "is this too easy", "balance my encounters", "encounter difficulty", "TPK check", "deadly encounter", "party level check", or mentions "challenge rating", "encounter math", or "XP budget". Analyzes module encounters against party composition using D&D 5e math to identify deadly, trivial, or unbalanced fights.

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Marketplace

mimir

mimir-dm/mimir

Plugin

mimir-dm

productivity

Repository

mimir-dm/mimir
4stars

crates/mimir-mcp/plugin/skills/encounter-balance/SKILL.md

Last Verified

February 2, 2026

Install Skill

Select agents to install to:

Scope:
npx add-skill https://github.com/mimir-dm/mimir/blob/main/crates/mimir-mcp/plugin/skills/encounter-balance/SKILL.md -a claude-code --skill encounter-balance

Installation paths:

Claude
.claude/skills/encounter-balance/
Powered by add-skill CLI

Instructions

# Encounter Balance Review

## Purpose

Analyze encounters in modules against expected party composition to identify deadly, trivial, or unbalanced fights using D&D 5e encounter math.

## Analysis Process

### 1. Establish Party Parameters

Ask for or assume:
- Number of players (default: 4)
- Average party level
- Party composition (optional, for tactical analysis)

### 2. Gather Encounter Data

```
get_campaign_details()
list_modules()
# For each module:
get_module_details(module_id: module_id)
# Extract monster list with counts

# Also check maps for token placements
list_maps(module_id: module_id)
get_map(map_id: map_id)  # includes token positions
```

**Important**: Verify the module exists and has monsters before analysis. If a monster is not found in the catalog via `search_monsters`, note it as homebrew.

### 3. Calculate Per Encounter

For each encounter:

1. **Sum base XP** — Add XP for each monster by CR (see references/5e-encounter-math.md)
2. **Apply multiplier** — Based on monster count
3. **Compare to thresholds** — Determine difficulty category
4. **Flag concerns** — Deadly, trivial, or resource-draining

### 4. Adventuring Day Analysis

D&D 5e assumes 6-8 medium encounters per long rest. Calculate:
- Total adjusted XP across module
- Expected adventuring days
- Resource pressure (will the party run out of spell slots?)

## Output Format

```markdown
# Encounter Balance Report: [Module Name]
**Party**: [X] players, level [Y]

## Daily XP Budget
- Easy threshold: [X] XP
- Medium threshold: [X] XP
- Hard threshold: [X] XP
- Deadly threshold: [X] XP
- Daily budget: [X] XP (6-8 medium encounters)

## Encounter Analysis

### [Encounter Name/Location]
| Monster | CR | Count | Base XP |
|---------|-----|-------|---------|
| [Name] | [CR] | [N] | [XP] |

- **Total Base XP**: [X]
- **Adjusted XP** (x[multiplier]): [X]
- **Difficulty**: [Easy/Medium/Hard/Deadly]
- **Assessment**: [Notes]

### Summary

| Encounter | Difficulty | Adjusted XP | Concern |
|------

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