Critical System — Revision History

File: 12_Kritik_Sistem_5e.md (old name: 10_Kritik_Sistem_5e.md, see K20) · This log: 12_Kritik_Sistem_REVIZYON_GECMISI.md (see K22) Location: 08_Ev_Kurallari/ Project: D&D 5e (2024) Homebrew Compendium — World Build / Claude_Projesi

Design Decisions (chronological)

#	Decision	Detail
K1	Trigger logic	Nat 20/1 + margin: beating/missing the target number by 5+. Graded.
K2	Scope	Everything: attack + save + check + spell.
K3	Severity logic	Matrix: DC/difficulty × action type. Blow it on a hard task and the price is steep.
K4	Generation	Subtable die — d10 (upgraded from d6 to match the reference file).
K5	Action types	Attack (melee/ranged/spell) · Physical Save (Str/Dex/Con) · Mental Save (Int/Wis/Cha) · Social (Persuasion/Deception/Intimidation) · Skill (Physical/Knowledge/Perception) · Spell (Damage/Healing/Control/Utility)
K6	Symmetry	Critical success = as detailed as critical failure.
K7	Spell handling	Path 2: spell is its own family, 4 subtypes by function, real mechanical difference. Cure Wounds does not deal explosive damage.
K8	Subtype structure	Each subtype gets its own completely separate d10 table (maximum detail).
K9	Difficulty bands	Low ≤13 · Medium 14–17 · High 18+
K10	Numbering	Separate from the monster series: `10_Kritik_Sistem_5e.md`
K11	Skill grouping	Physical / Knowledge / Perception (confirmed)
K12	Reference example	Adopted the "Blade Complications" (Betterspellcaster) quality bar: every row specific+mechanical, DC=8+PB+mod, "one effect per turn," "row doesn't feed itself" rules.
K13	Spell attack two axes	Spell attack outcome scales with AC band × spell level. The AC band picks the row, the level tier (0/1/2/3) sets the numeric weight. Cantrip=baseline, 6+=×3. Prevents cantrip spam, high-level crit hits with the weight it deserves.
K14	Backlash preserves the spell's shape	On failure, the backlashing spell keeps its original shape: single target → goes to a random ally/creature (a new attack roll is made), area → shifts 5×1d4 ft randomly, detonates at the new point with its normal area (everyone makes a Dex save, half damage on a pass).
K15	Backlash damage = slot × die + Safety Floor	Damage (S1): Light slot×1d6 · Medium slot×1d10 · Heavy slot×2d6. NOT the spell's own damage (that's scaled to drop an enemy and would kill the caster); a small slot-based window instead. Cantrips don't backlash. Safety Floor: in combat, the first failure's backlash cannot drop the caster below (Max HP÷4 + Con mod); if already below it, 0 damage → the first failure NEVER kills. No floor on subsequent failures (back-to-back mistakes aren't forgiven). Verified by simulation: first failure 0% death, second failure at low HP 62-100% death. The tier multiplier does not apply to backlash (success table only).
K16	Social failure = External Interruption + Self-Mistake	Social failure does not negate the character's competence. Two layers: [External] Interruption (a fight breaks out, a celebrity enters the scene, a guard walks in — the character doesn't look incompetent) and [Self] Mistake (the lie is spotted, a slip is made — rare but present). The two families have different ratios: Performative (Persuasion/scene) ~70% External/30% Self; Tactical (Deception/Intimidation) ~70% Self/30% External (because a bluff/threat failure comes directly from your own move). Every row is tagged [External]/[Self]. The success side is blended ([Blend] = an external event turns in your favor).
K17	Spells split into 4 families by function	Spells aren't a single type — they branch by function. F1 Damage (backlash tied to A3), F2 Healing (NEVER explodes/deals damage — failure = healing wasted/slot burned/falls short; the definitive fix for the Cure Wounds concern), F3 Control (backlash = wrong target/mildly affects the caster, rarely damage), F4 Utility (position/perception drift, dieless spells only when the DM wants the risk). For save-based spells the trigger is the TARGET'S save roll (target nat1 → crit in your favor).
K18	Healing arcane backlash (revision)	Healing spells never damage the target (no explosion), but on heavy failures an arcane backlash hits only the caster. Damage = 1/3 of the nominal healing (proportional to healing power — per user request). Only on rows tagged [Backlash] (High band 1/2/8/10 + Medium 8). Safety Floor applies (first failure doesn't kill). Simulation: the 1/3 ratio is only 31% HP even for the highest-level spell (Heal), safe with the floor. The "doesn't explode ≠ doesn't backlash" distinction: healing energy flows back and hits the caster instead.
K19	Backlash type by source (5 types)	The backlashing energy is colored by the spell's source (instead of fixed Force): Divine/Holy→Radiant, Dark/Cursed→Necrotic, Nature/Primal→Poison, Arcane/Magical→Force, Spirit/Fey→Psychic. Applies to all spell backlash (F1 damage + F2 healing). Rule: if the damage spell has its own type, use it (fire→Fire); type-neutral/healing spells → source table. A shared table was added at the top of Section F.
K20	Library integration: number 12 + `08_Ev_Kurallari/`	Since number 10 in the main library (Claude_Projesi) is used by `10_World_Foundations_5e.md`, K10 was revised: the file was renumbered as `12_Kritik_Sistem_5e.md` (first open number in the global order). A new category folder `08_Ev_Kurallari/` was opened; other homebrew rule modules will go here in the future. The full package (revizyonlar/ + simulasyonlar/) was moved together with the folder. Content unchanged.
K21	Version archive moved to the library backup system + module-addition template	The `revizyonlar/` subfolder was removed: 13 snapshots were moved under `_yedek/20260719_kritik-sistem-surum-arsivi/` with the naming `12_Kritik_Sistem_5e_vX.Y_<etiket>.md` — library rule: content folders don't keep a backup/archive subfolder, all backups live under `_yedek/`. Future version snapshots go there too. A template + working discipline for adding future homebrew modules was written into `_PROJE_INDEX.md` as a permanent rule (the "Homebrew System Modules" section).
K22	Module document naming standard	Since multiple modules are accumulating in `08_Ev_Kurallari/`, module documents now carry a module number + system name prefix: this file was renamed to `12_Kritik_Sistem_REVIZYON_GECMISI.md`. New module documents are added under the same standard (e.g., `13_Olay_Sistemi_REVIZYON_NOTLARI.md`). Rationale: since every Cowork handoff package arrives with the same generic names (REVIZYON_*, SONUC_RAPORU), collisions were inevitable. Content unchanged.

Version Log

v0.1 — Core + A1 Melee

Section 0 (core rule, triggering, severity principle, limiting rules) written.
Section A1 (Melee) success + failure, 3 difficulty bands × d10 completed.
User approval: intensity and High-band severity found appropriate.

v0.2 — Section A complete (Ranged + Spell Attack added)

A2 Ranged success + failure × 3 bands × d10. Identity: range/ammunition/position/cover/rapid fire.
A3 Spell Attack success + failure × 3 bands × d10. Identity: spell leakage, school coloring (damage type follows the spell's type), concentration interaction, backlash.
Contents section added.
Note: spell-specific mechanics such as "slot not consumed" and "concentration breaks" were added to spell attack failure — to stay consistent with Section F.

v0.3 — Spell attack level scaling

Spell level tier added to A3 (0/1/2/3). The AC band picks the row, the level sets the numeric weight.
Both success and failure tables use the same scale (backlash damage also grows with level).
Explained with an example (Fire Bolt vs upcast Scorching Ray).

v0.4 — Backlash shape preservation (D2/D3 revision)

A Backlash Rule block added to A3 failure: the spell's shape is preserved (single target → random creature + new attack roll; area → 5×1d4 ft shift + normal detonation).
Backlash damage was tied to the spell's own damage (Light ½ / Medium full / Heavy full+effect). Tier multiplier does not apply to backlash (prevents double counting).
The D2 row was tied to severity tags in all three bands; the fixed "½ damage" was removed.
D3 was clarified as "leakage" and made to scale with the level tier.

v0.5 — Backlash damage model finalized (S1 + Con-based floor)

Backlash damage moved from the spell's own damage reference to the slot × die model (S1: Light slot×1d6 / Medium slot×1d10 / Heavy slot×2d6). Reason: simulation showed the "spell damage" reference killed the caster (Fireball 104% HP).
Safety Floor added: (Max HP÷4 + Con mod), active only on the first failure in combat. User contribution: Con modifier added (prevents wipeout at low level) + "first failure is forgiven, second is not" logic.
Dex save halves it added to area spell backlash (extra safety).
Clarified that the tier multiplier is only for the success table (does not apply to backlash).
D3 leakage rows were tied to slot×1d4.
Decision: damage model S1 chosen (S3 vs S1 comparison simulated; S1 preferred for giving a harsher second-failure penalty).
Validation: first failure 0% death across every spell/level/HP scenario; second failure at 25% HP 62-100% death.

v0.6 — Section B: Physical Saving Throw

Save logic was reversed: the player rolls the save, critical success = clean escape, critical failure = caught by the threat. Difficulty band = the threat's save DC.
B1 Strength (grapple/shove/crush/knock down) success+failure × 3 bands × d10.
B2 Dexterity (area/reflex/trap/fall — the "half damage on a save lands as full" mechanic on failure) success+failure × 3 bands × d10.
B3 Constitution (poison/disease/fatigue/Exhaustion/Concentration) success+failure × 3 bands × d10.
High band carries persistent/severe outcomes like Exhaustion, Poisoned (with a recovery save), Concentration breaking; low band carries mild/1-turn effects.

v0.7 — Section C: Mental Saving Throw

C1 Intelligence (illusion/psychic/mind reading) success+failure × 3 bands × d10. Failure brings illusion, memory loss, mental captivity, short madness.
C2 Wisdom (willpower/fear/charm/instinct) success+failure × 3 bands × d10. Failure brings Frightened, Charmed, flight instinct, Short-Term Madness.
C3 Charisma (self/soul/possession/banishment) success+failure × 3 bands × d10. Failure brings a possession door, soul erosion (max HP), semi-banishment, identity loss.
Structure consistent with Section B (save DC band, reversed logic, mental condition weight).

Social failure was split into two layers: [External] Interruption and [Self] Mistake. User insight: a master character (bard, etc.) shouldn't suddenly give a mediocre performance; instead, external events (a fight, a famous rival, an interruption) should kick in.
Two social families defined: Performative (Persuasion) ~70% External/30% Self; Tactical (Deception/Intimidation) reversed ratio ~70% Self/30% External.
D1 Persuasion / D2 Deception / D3 Intimidation success+failure × 3 bands × d10.
The success side is blended ([Blend] rows are an external event turning in your favor).
Difficulty band = social DC / target attitude (friendly→hostile).

v0.9 — Section E: Skill Checks

E1 Physical (Athletics/Acrobatics/Stealth/Sleight of Hand) success+failure × 3 bands × d10. Weighted toward situational mishaps (environmental difficulty, noise, stumbling, falling).
E2 Knowledge (Arcana/History/Nature/Religion/Investigation) success+failure × 3 bands × d10. Critical design decision: NO "wrong information" on failure — only "couldn't recall/not sure/incomplete." The expert character doesn't turn dumb (the knowledge version of the Section D lesson).
E3 Perception/Interaction (Perception/Insight/Survival/Medicine/Animal Handling) success+failure × 3 bands × d10. Weighted toward "you missed it/misread it," situational.

v0.10 — Section F: Spells (4 families by function)

F1 Damage success+failure × 3 bands × d10. Backlash tied to the A3 rule. Band = spell level.
F2 Healing success+failure × 3 bands × d10. The definitive fix for the Cure Wounds concern: no row deals damage. Failure = healing halved / slot burned / delayed / goes to the wrong target / incomplete cleansing.
F3 Control success+failure × 3 bands × d10. Backlash = wrong targeting / mildly affecting the caster, rarely damage.
F4 Utility success+failure × 3 bands × d10. Position/perception drift, Dispel/Counter contest. Dieless spells only when the DM wants the risk.
Clear routing at the top of the section: spell attack → A3, save-based → trigger is the target's save roll, dieless → DM risk only.
A "healing roll" option for healing crits (nat 20/nat 1, no margin — because there's no DC). Detail left to Section H.

v0.11 — Healing arcane backlash (F2 revision)

User correction: "doesn't explode ≠ doesn't backlash." Healing spells don't damage the target, but since it's arcane energy, a heavy failure can backlash onto the caster.
Path C chosen: functional penalty (healing wasted) + caster backlash on heavy rows.
Backlash = 1/3 of the nominal healing, Force type (proportional to healing power). Verified by simulation: safe even for the highest-level spell, Safety Floor applies.
Only on heavy rows tagged [Backlash] (High band 1/2/8/10 + Medium band 8). No damage on most failures.
Damage only to the caster, never the target.

v0.12 — Backlash type by source (5 types)

User request: instead of fixed Force, the backlash type should be colored by the spell's source.
A Backlash Type table was added at the top of Section F: Divine→Radiant, Dark→Necrotic, Nature→Poison, Arcane→Force, Spirit/Fey→Psychic.
Applies to all spell backlash (F1 + F2). Rule: the damage spell's own type takes priority (fire→Fire); type-neutral/healing → source table.
The 4 "Force" references in F2 were tied to "source type." The free-standing fixed Force was removed.

v1.0 — Section G + H (SYSTEM COMPLETE)

Section G — Master Reference: G1 which table/trigger/band matrix, G2 common triggering, G3 band thresholds, G4 core limiting rules, G5 spell backlash summary. DM screen card.
Section H — Tuning Knobs: H1 severity dial, H2 margin threshold (Off/5+/10+; 10+ recommended at high level), H3 healing crit trigger, H4 fumble severity, H5 Safety Floor mode, H6 social External/Self ratio, H7 speed mode.
Markdown fixes (double asterisk).
Version 1.0 declared. All action types (A–F) + reference (G) + settings (H) completed.

v1.0.1 — Library integration (2026-07-19)

The system was moved into the World Build / Claude_Projesi library: new category folder 08_Ev_Kurallari/ (K20).
The main file was renumbered as 12_Kritik_Sistem_5e.md (number 10 in the library was already used by 10_World_Foundations_5e.md; K10 revised).
The full package was moved: main file + this revision history + revizyonlar/ (13 snapshots) + simulasyonlar/ (7 Python scripts).
_INDEX.md and _PROJE_INDEX.md were updated; the library's backup rule was followed.
Rule content unchanged — identical to v1.0.

v1.0.2 — Structure reorganization (2026-07-19)

The revizyonlar/ subfolder was removed; 13 version snapshots were moved to the library's central backup system: _yedek/20260719_kritik-sistem-surum-arsivi/ (K21).
A template and working discipline for future homebrew system modules was added to _PROJE_INDEX.md as a permanent rule — new sessions can build context from this file + _PROJE_INDEX.md without a handoff prompt.
Rule content unchanged again — identical to v1.0.

v1.0.3 — Log naming (2026-07-19)

This file was renamed from REVIZYON_GECMISI.md → 12_Kritik_Sistem_REVIZYON_GECMISI.md (K22, module document naming standard; collision avoidance with the addition of the Event System).
Rule content unchanged.

Section Inventory (v1.0)

Section	Content	Number of tables
0	Core rule	—
A	Attack (melee/ranged/spell)	6 (3 subtypes × success/failure)
B	Physical save (Str/Dex/Con)	6
C	Mental save (Int/Wis/Cha)	6
D	Social (Persuasion/Deception/Intimidation)	6
E	Skill (Physical/Knowledge/Perception)	6
F	Spell (Damage/Healing/Control/Utility)	8 (4 subtypes × success/failure)
G	Master reference	5 subtables
H	Tuning knobs	7 knobs

Total ~38 d10 crit tables + reference + settings.