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neon-sprawl/docs/decomposition/modules/E2_M2_XpAwardAndLevelEngine.md

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E2.M2 — XpAwardAndLevelEngine

Summary

Field Value
Module ID E2.M2
Epic Epic 2 — Classless Progression
Stage target Prototype
Status Planned (see dependency register)

Purpose

Central server-authoritative engine for classless skill progression: applying XP grants, resolving levels against data-driven curves, and emitting level-up events. Gathering, crafting, and combat integrate as callers of this API without being hard dependencies for implementing the engine itself (see Epic 2 Slice 2 vs Slice 3).

Responsibilities

  • Apply XpGrantEvent (or equivalent) per skill with validated skill references from E2.M1.
  • Resolve experience against LevelCurve / threshold tables.
  • Emit LevelUpEvent when thresholds are crossed.
  • Support data-driven curves and reload policy agreed for prototype.

Key contracts

Contract Role
XpGrantEvent Structured XP award (skill id, amount, source, modifiers).
LevelCurve Thresholds or formula per skill or global policy.
LevelUpEvent Notification for UI, unlocks, and downstream systems.

Module dependencies

Dependents (by design)

  • E5.M1 — CombatRulesEngine: combat awards XP via integration (Epic 5 / Epic 2 slices).
  • E3.M1 / E3.M2 — Gathering and crafting award XP when wired in Slice 3.
  • E7.M2 — RewardAndUnlockRouter routes quest rewards including XP through E2.M2.
  • E2.M3 / E2.M4 — Mastery and pacing layers build on level/XP state (pre-production).

Related implementation slices

  • Epic 2 Slice 2 — XP engine (E2.M2 core): implement contracts and tests without requiring Epic 3 or 5 modules.
  • Epic 2 Slice 3 — XP award integration: wire E3.M1, E3.M2, E5.M1 to the award API for three prototype skill lines.

Risks and telemetry

  • Runaway leveling in one skill: diminishing returns per slice; monitor distribution via E9.M2 when available.
  • Telemetry: xp_grant, level_up, time-to-first-level-up once real activity fires.

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