---
name: migrate-items-mobiles
description: >
  Trigger: when converting RunUO Item, Mobile, or BaseCreature subclasses to ModernUO. Most common migration task.
  Covers: complete item/creature conversion combining serialization, timers, properties, naming.
---

# RunUO -> ModernUO Item/Mobile/Creature Migration

## When This Activates
- Converting any `Item` subclass from RunUO
- Converting any `Mobile`/`BaseCreature` subclass
- This is the most common migration task -- combines all other systems

## Item Conversion Checklist
1. [ ] Foundation: file-scoped namespace, `using ModernUO.Serialization;`
2. [ ] Class: add `[SerializationGenerator(N, false)]` (N = old version + 1, `false` if old `Deserialize` used `ReadInt()`), add `partial`
3. [ ] Fields: `m_X` -> `[SerializableField(N)] _x` with `[SerializedCommandProperty]`
4. [ ] Add `[InvalidateProperties]` where RunUO setter called `InvalidateProperties()`
5. [ ] Delete: Serial constructor, Serialize, Deserialize
6. [ ] `[Constructable]` -> `[Constructible]`
7. [ ] `Name = "text"` -> `public override string DefaultName => "text";`
8. [ ] Timers: nested class -> `Timer.StartTimer()` + `TimerExecutionToken` + `[AfterDeserialization]` + `OnAfterDelete`
9. [ ] Properties: `GetProperties(ObjectPropertyList)` -> `GetProperties(IPropertyList)`, apply string hole rule
10. [ ] Context menus: `List<ContextMenuEntry>` -> `ref PooledRefList<ContextMenuEntry>`

## Creature-Specific Changes
- `[CorpseName("...")]` attribute -> `public override string CorpseName => "...";`
- `BaseCreature(AI, Fight, 10, 1, 0.2, 0.4)` -> `BaseCreature(AI, Fight)` (extra params default)
- `Name = "text"` -> `public override string DefaultName => "text";`
- Expression-bodied overrides: `public override int Meat { get { return 1; } }` -> `public override int Meat => 1;`
- AI movement calls lose the `run` flag: `MoveTo(m, true, range)` -> `MoveTo(m, range)` (also `WalkMobileRange`, `ApproachTarget`, `MoveToPoint`, `PathFollower.Follow`); the Running bit is derived from step pace -> `dev-docs/runuo-migration-docs/09-items-mobiles-creatures.md` § AI Movement
- `AcquireOnApproach` (bool) -> `AcquireOnApproachDelay` (TimeSpan; `Zero` = old instant behavior) -> same doc § Target Acquisition
- `BaseAI.OnAggressiveAction(aggressor)` is `bool`, not `void`: the AI owns the retaliation policy (`BaseCreature` no longer sets `Combatant` after it); an early `return;` that refused a fight -> `return false;`, otherwise `return true;`; swap-only overrides call `PreferCloserAggressor(aggressor)` instead of `base` -> same doc § Retaliation
- `DamageEntries` is an inline `ref readonly ValueLinkList<DamageEntry>`, not a `List`: indexer/`Add`/`Remove`/`Clear` -> `foreach` / `.ByDescending()` (needs `using Server.Collections;`) and `ClearDamageEntries()`; `GetLootingRights` takes it by `in` -> same doc § Damage Entries
- `ControlMaster`/`SummonMaster` are views of one `Master`, gated by `Controlled`/`Summoned`; assignments still compile (they set `Master`). `ControlMaster ?? SummonMaster` and controlled-or-summoned pairs -> `GetMaster()`; a creature that sets `SummonMaster` without `Summoned` (RunUO's `BaseEnraged`) must read `Master`, because `SummonMaster` now reads null -> same doc § Masters

## Anti-Patterns
- Using `_field--` instead of `Property--` (bypasses MarkDirty tracking)
- Forgetting `[AfterDeserialization]` for timer restoration
- Forgetting `OnAfterDelete()` for timer cancellation

## See Also
- `dev-docs/runuo-migration-docs/09-items-mobiles-creatures.md` -- detailed migration with before/after examples
- `dev-docs/content-patterns.md` -- ModernUO content templates
- `dev-docs/claude-skills/modernuo-content-patterns.md` -- ModernUO content skill
- `dev-docs/claude-skills/modernuo-serialization.md` -- serialization patterns
- `dev-docs/claude-skills/modernuo-timers.md` -- timer patterns