# Source

- **Document:** System Reference Document 5.1 ("SRD 5.1") by Wizards of
 the Coast LLC — the official CC-BY-4.0 PDF, `SRD_CC_v5.1.pdf`.
- **Canonical page:** https://www.dndbeyond.com/srd (also linked from
 https://dnd.wizards.com/resources/systems-reference-document)
- **PDF fetched:** https://media.wizards.com/2023/downloads/dnd/SRD_CC_v5.1.pdf
- **License:** Creative Commons Attribution 4.0 International
 (CC-BY-4.0). See the license statement below and `ATTRIBUTION.md`.
- **Extraction date:** 2026-07-19, transcribed from the official PDF's
 own text (pdftotext). Sections used: Races pp. 3-7; Equipment
 pp. 63-66; Using Ability Scores pp. 77-78; Monsters (statistics rules:
 Hit Dice by Size, Proficiency Bonus by Challenge Rating, Experience
 Points by Challenge Rating, skill/save bonus formulas) pp. 254-257;
 Appendix MM-B: Nonplayer Characters pp. 395-403.
- **Cross-check:** spot values (longsword, plate armor, the guard block,
 half-orc traits) matched the community 5e-bits database
 (dnd5eapi.co). The authoritative source is the official SRD document.

### The 5.2.1 chassis and retained 5.1 content

SRD 5.2.1 (the 2024 revision) is licensed under the SAME CC-BY-4.0 grant as
5.1, so the choice between them is a DESIGN one, never a licensing one, and
the corpus may draw on both.

**5.2.1 is the rules chassis**.
Where both SRDs print a rule or record, the 5.2.1 definition wins. Nonconflicting
5.1 catalogue material retains its own provenance. A `*.srd52.ron` file
transcribes 5.2.1 and says so in its `source`; no active id is defined twice.

The SRD 5.2.1 encounter tables are `tables/encounter_xp_budgets.srd52.ron`
(level 1–20, Low/Moderate/High XP per character) and
`tables/cr_xp.srd52.ron` (XP by CR). Battle sums the selected difficulty's
budget for **each** party member, including mixed levels, and spends that
total on creature XP without a creature-count multiplier. Its strength dial
selects Low at −1, Moderate at 0, and High at +1; −2 halves Low and +2
doubles High as game extensions. The dungeon's occupancy-rated chamber
allotments remain party blind and use the same CR→XP price table.