## Summary
After #2670, `BaseCreature` stores one master. Callers still reached it through three differently gated names plus hand-rolled combinations of the `Controlled`/`Summoned` flags. Each gate is now one named view:
| Member | Definition | Meaning |
|---|---|---|
| `Master` | the reference; its setter does the follower bookkeeping; serialized as before | whoever the creature answers to |
| `ControlMaster` | `Controlled ? Master : null` | the owner |
| `SummonMaster` | `Summoned ? Master : null` | the summoner |
| `GetMaster()` | `ControlMaster ?? SummonMaster` | who answers for the creature |
`ControlMaster` and `SummonMaster` stay settable so custom code keeps compiling: both setters assign `Master`. There is no guard, so a write through either one can read back as null until the matching flag is set.
An enraged creature is the one shape with a master and neither flag. It keeps its meer through `Master`, while `GetMaster()` stays null, so the meer never answers for it (notoriety, kill credit).
Readers move onto the view they mean:
- "Owner or summoner" pairs and `ControlMaster ?? SummonMaster` collapse into `GetMaster()`: pack instinct, familiars, golem, house access, mounts, pack horse, Solen friendship, spell target and guild checks, and the `[` pet command.
- Checks such as `Controlled && ControlMaster == from` drop the flag the view already applies. Checks that don't reduce keep it: `Controlled && ControlMaster != from`, a possibly-null `from`, and `MageAI.CanDispel`'s `Summoned &&`.
**No behavior change, save format unchanged** (the schema generator produces no diff). Edge cases for custom code and shard operators:
- `SummonMaster = x` on a plain pet now replaces its owner (#2670 made that a no-op), and `ControlMaster = null` on an uncontrolled summon now clears its caster (it did nothing before).
- `SpellHelper.GetGuildFor` no longer falls back to an enraged creature's meer. Meer mages have no guild.
## Docs
- `dev-docs/content-patterns.md` § Masters: which view answers which question, how to set a master, and which flag checks are redundant.
- `dev-docs/runuo-migration-docs/09-items-mobiles-creatures.md` § Masters: RunUO's two-field reads mapped onto the views, plus the gotcha for creatures that set `SummonMaster` without `Summoned` (the write compiles, the read now returns null; use `Master`).
- The `modernuo-content-patterns` and `migrate-items-mobiles` skills point at both.
## Test plan
- [x] `MasterViewsTests`: all four views across wild, pet, controlled summon, uncontrolled summon and enraged shapes; reassigning `Master` moves follower slots; `SetControlMaster(null)` keeps an uncontrolled summon's caster; deleting a summon returns the caster's slots
- [x] Serialization tests updated to the new views (round-trip, legacy v22, v23 migration)
- [x] UOContent.Tests (1178 passed, 2 skipped) and Server.Tests (907) green
Readers of `ControlMaster` that act on "this creature is a player's pet" now also require
`Controlled`. Nothing sets a master on an uncontrolled creature today, so behavior does not
change, except that the ML notoriety branch was the one read with nothing in front of it.
The guard keeps these readers correct if a creature ever keeps a master without being
controlled (a suspended-control state such as a charm or turn-pet ability, or folding
SummonMaster into one master field).
- Notoriety (ML): a creature only takes its master's notoriety while controlled
- BaseCreature.AggressiveAction: the aggressor link to the master only applies to controlled pets
- PlayerMobile.AutoStablePets: uncontrolled summons (blade spirits, energy vortexes) are skipped
- CrystalCaveBarrier: only a controlled pet passes on its owner's quest progress
- Discordance: the own-pet exception only applies to a controlled pet
- Dismount (ML): the remount block only goes to the owner of a controlled pet
Also removes the "Summons from monsters can attack players" branch in Mobile_AllowHarmful.
It has been unreachable since #2000: a creature with no player master returns from the
NPC check above it.
Tests: UOContent.Tests 1158 passed.
### Summary
- [X] Lightning arrow no longer allows SDI
- [X] Lightning arrow now proc's even without arrows
- [X] Fixed NPE with lightning arrow when a monster is already killed.
* Movie ignore mobiles to Mobile class
* Allow necromancer familiars to ignore mobiles
* ChampionSpawn should not quietly fail when creating new spawn
* Fix client party crash bug: 2 people partied, the leader logs out, other client is hung
* Fix spellbooks creating with magery/meditation only and creating magery multiple times
* Fix BaseRunicTool.GetRandomSlayer() creating more undead slayers than intended
* Do not allow players to dismount each other whilst mounted
* Fix AOS onwards damage increase tooltip and wrong formula in AOS
* Fix monsters killing other monster revenants + animate dead should not attack player pets + other animates
* Fix fire steed having loot pack added twice
* Fix oaks spawn not able to create Unicorns + Kirins via Activator.CreateInstace() due to constructor having name as parametr
* Fix ignoreMobiles flag not propagated to client for non-players.
* Fix harrower tents not leeching from players
* Fix boats speedhacking around the map
* Fix bless, agility etc. not renewing duration
* Fix reveal always worked
* Fix empty constructor for steeds so they don't throw now.
- [X] Exposes Index/Count on the timer.
- [X] Cleans up abilities
- [X] Combines some spell context/info objects with their timers to reduce allocations
- [X] Fixes a bug where immolating weapon both finishes effect or stops in the wrong order due to a race condition.
