d20-players

Character Creation and Advancement Skill

Guide players through creating and advancing d20 system characters following SRD 5.2 rules.

File Structure

Character files follow the corvran directory structure with D20-specific content:

players/
  {character-slug}/
    sheet.md   # Use sheet-template.md format (stats, abilities, equipment, current HP, conditions)
    story.md   # Use story-template.md format (objectives, story arcs, recent events)

The sheet.md contains character data including current game state (HP, conditions, spell slots). The story.md tracks narrative elements like objectives and story arcs.

Character Creation Overview

Follow these five steps to create a new character:

1. Choose a Class - Determines primary abilities, hit die, proficiencies, and features
2. Determine Origin - Select background (grants feat, skills, tool) and species (grants traits, size, speed)
3. Determine Ability Scores - Generate six scores and assign to abilities
4. Choose Alignment - Select moral and ethical outlook
5. Fill in Details - Calculate derived stats and record equipment

Generating Ability Scores

Offer three methods to generate the six ability scores.

Standard Array

Use these six scores, assigning each to one ability: 15, 14, 13, 12, 10, 8

Random Generation

For each of the six abilities, roll 4d6 and sum the highest three dice:

Use the mcp__corvran__roll_dice tool:
{ "groups": [{ "n": 4, "d": 6 }] }

Discard the lowest roll from the result and sum the remaining three. Repeat six times.

Point Buy

Start with 27 points. Each ability starts at 8 (free). Costs to increase:

Score	Total Cost	Score	Total Cost
8	0	12	4
9	1	13	5
10	2	14	7
11	3	15	9

Calculating Derived Statistics

After assigning ability scores, calculate these values:

Ability Modifier

Modifier = (Score - 10) / 2, rounded down

Score	Modifier	Score	Modifier
8-9	-1	14-15	+2
10-11	+0	16-17	+3
12-13	+1	18-19	+4

Proficiency Bonus by Level

Level	Bonus	Level	Bonus
1-4	+2	13-16	+5
5-8	+3	17-20	+6
9-12	+4

Hit Points at Level 1

Class	HP at Level 1
Barbarian	12 + CON modifier
Fighter, Paladin, Ranger	10 + CON modifier
Bard, Cleric, Druid, Monk, Rogue, Warlock	8 + CON modifier
Sorcerer, Wizard	6 + CON modifier

Armor Class (AC)

Without armor: 10 + DEX modifier

With armor, use the armor's AC formula from the equipment tables.

Initiative

Initiative = DEX modifier

Saving Throws

Each class grants proficiency in two saving throws. For proficient saves:

Save Bonus = Ability Modifier + Proficiency Bonus

Skills

For proficient skills:

Skill Bonus = Ability Modifier + Proficiency Bonus

Passive Perception

Passive Perception = 10 + Wisdom (Perception) modifier

Recording the Character

Write character data to players/{character-slug}/sheet.md using the D20 template:

references/sheet-template.md

For a completed example, see:

references/sheet-example.md

D20 Sheet Sections

The sheet.md file must include:

1. Character Identity - Name, class, level, species, background, alignment
2. Ability Scores - All six scores with modifiers
3. Combat Stats - AC, HP (current/max), Hit Dice, Initiative, Speed
4. Proficiencies - Saving throws, skills, weapons, armor, tools, languages
5. Features & Traits - Class features, species traits, background feat
6. Equipment - Weapons with attack/damage, armor, gear, currency
7. Spellcasting (if applicable) - Ability, DC, attack bonus, slots, spells known

Level Advancement

When a character gains enough XP to level up:

Experience Thresholds

Level	XP Required	Level	XP Required
2	300	11	85,000
3	900	12	100,000
4	2,700	13	120,000
5	6,500	14	140,000
6	14,000	15	165,000
7	23,000	16	195,000
8	34,000	17	225,000
9	48,000	18	265,000
10	64,000	19	305,000
		20	355,000

Level Up Steps

1. Increase Hit Points - Roll Hit Die + CON modifier (or use fixed value):

Roll HP:

Use the mcp__corvran__roll_dice tool:
{ "groups": [{ "n": 1, "d": 10 }] }

Fixed HP values per level:

Class	HP per Level
Barbarian	7 + CON modifier
Fighter, Paladin, Ranger	6 + CON modifier
Bard, Cleric, Druid, Monk, Rogue, Warlock	5 + CON modifier
Sorcerer, Wizard	4 + CON modifier

2. Gain Hit Die - Add one Hit Die to your pool
3. Check Proficiency Bonus - Increases at levels 5, 9, 13, 17
4. Record New Features - Add class features for the new level
5. Choose Subclass (Level 3) - Record subclass features
6. Ability Score Improvement (Levels 4, 8, 12, 16, 19) - Increase one score by 2 or two scores by 1, or choose a feat

Multiclassing

To take a level in a new class:

1. Check Prerequisites - Must have 13+ in primary abilities of both current and new class
2. Gain Limited Proficiencies - Only some proficiencies from the new class
3. Calculate Spellcasting - Combine levels per multiclass spellcaster rules

Rolling During Character Creation

Use the mcp__corvran__roll_dice tool for all randomization:

Ability Score (4d6 drop lowest):

Use the mcp__corvran__roll_dice tool:
{ "groups": [{ "n": 4, "d": 6 }] }

Starting Gold (if not using equipment packs):

Use the mcp__corvran__roll_dice tool:
{ "groups": [{ "n": 5, "d": 4 }] }

Trinket Roll:

Use the mcp__corvran__roll_dice tool:
{ "groups": [{ "n": 1, "d": 100 }] }

References

Detailed rules in this skill's references/ directory:

• character-creation.md - Complete SRD 5.2 character creation rules
• sheet-template.md - Blank character sheet template
• story-template.md - Character story template (objectives, arcs, events)
• sheet-example.md - Completed Level 3 Fighter example